9/11 Commission Report/Notes/Part 9

Heroism and Horror
1. For the WTC's layout, see Port Authority diagrams, "World Trade Center Concourse Level," "Concourse Level," and "Plaza Level," undated. For the number of square feet of office space, see Federal Emergency Management Agency (FEMA) report, "World Trade Center Building Performance Study," undated. For the number of workers and passersby, see Port Authority briefing (May 13, 2004).

For the dimensions, see FEMA report, "World Trade Center Building Performance Study," undated. In addition, the outside of each tower was covered by a frame of 14-inch-wide steel columns; the centers of the steel columns were 40 inches apart.These exterior walls bore most of the weight of the building.The interior core of the buildings was a hollow steel shaft, in which elevators and stairwells were grouped. Ibid. For stairwells and elevators, see Port Authority response to Commission interrogatory, May 2004.

2. See Port Authority response to Commission interrogatory, May 2004.

3. Ibid.These deviations were necessary because of the placement of heavy elevators and machine rooms, and were located between the 42nd and 48th floors and the 76th and 82nd floors in both towers. For the doors being closed but unlocked, see Port Authority briefing (May 13, 2004).

4. For rooftop access and evacuations, see Port Authority response to Commission interrogatory, May 2004. For the helipad not conforming, see PANYNJ interview 14 (July 8, 2004). In the interests of promoting candor and protecting privacy, we agreed not to identify most individuals we interviewed. Individuals are identified by a code, and individuals' ranks or units are disclosed only in a broad manner.

5. For the 1993 attack's effect, see Alan Reiss testimony, May 18, 2004. For the attack's testing the city's response capability, see FDNY report,"Report from the Chief of Department,Anthony L. Fusco," in William Manning, ed., The World Trade Center Bombing: Report and Analysis (FEMA, undated), p. 11.

6. For the towers' loss of power and the other effects, see New York City report,"Report of the World Trade Center Review Committee,"1995, p. 4. For generators' shutting down, see Port Authority briefing (May 13, 2004). For the rescue efforts, see FDNY report,"Report from the Chief of Department,Anthony L. Fusco," in Manning, ed., The World Trade Center Bombing, p. 11. For the evacuation time, see PANYNJ interview 5 (May 15, 2004).

7. For information on rooftop evacuations, see Port Authority response to Commission interrogatory, May 2004; NYPD interview 25, Aviation (June 21, 2004). For the rappel rescue, see Port Authority response to Commission interrogatory, May 2004. For figure of 15 hours, see "World Trade Center Bombing," NY Cop Online Magazine, Dec. 12, 2000 (online at www.nycop.com). For the general false impression, see Civilian interview 3 (May 4, 2004); Commission analysis of letters written to the Occupational Safety and Health Administration (OSHA) concerning the September 11 attacks. For the WTC fire safety plan, see Port Authority response to Commission interrogatory, May 2004.

8. For the upgrades, see Port Authority memorandum to the Commission for Nov. 3, 2003, meeting; Port Authority briefing (May 13, 2004).

9. For the upgrades, see Port Authority memorandum to the Commission for Nov. 3, 2003, meeting; Port Authority response to Commission interrogatory, May 2004. For the fire alarm, see PANYNJ interview 10 (June 16, 2004); PANYNJ interview 7 (June 2, 2004).

10. Port Authority memorandum to Commission for Nov. 3, 2003 meeting;WTC interview 6 (May 25, 2004).

11. For fire safety teams, see PANYNJ Interview 7 (Jun. 2, 2004). For fire drill procedures, see Civilian interview 1 (Mar. 2, 2004); Civilian interview 10 (Mar. 24, 2004). For aids to the September 11 evacuation, see, e.g., Civilian interview 14 (Apr. 7, 2004); Civilian interview 20 (May 4, 2004); Civilian interview 21 (May 4, 2004); Civilian Interview 13 (Mar. 25, 2004).

12. For instructions to civilians, see, e.g., Civilian interview 20 (May 4, 2004); Civilian interview 21 (May 4, 2004); Civilian interview 12 (May 4, 2004); Stanley Praimnath testimony, May 18, 2004 (videotaped). For civilians' participation, see Civilian interview 10 (Mar. 24, 2004); Civilian interview 15 (Apr. 21, 2004); Commission analysis of letters written to OSHA concerning the September 11 attacks. For civilians not being instructed not to evacuate up, see Port Authority briefing (May 13, 2004). For the standard fire drill announcement, see Port Authority response to Commission interrogatory, May 2004. For civilians' recollection, see Civilian interview 1 (Mar. 2, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian interview 10 (Mar. 24, 2004). For Port Authority acknowledgment of lack of a protocol, see PANYNJ interview 2 (Apr. 14, 2004).

13. For SPI transition, see PANYNJ Interview 11 (Jun. 23, 2004);Alan Reiss prepared statement, May 18, 2004,

p. 8. For fire safety plan, see PANYNJ Interview 8 (June 6, 2004).

14. See Port Authority Police Department (PAPD) report, "Port Authority of New York and New Jersey," undated (online at www.panynj.gov).

15. PANYNJ interview 4 (May 10, 2004).

16. For 40,000 officers, see NYPD information provided to the Commission, July 9, 2004. For standard operating procedures, see NYPD regulations, "Patrol Guide: Rapid Mobilization," and "Patrol Guide: Mobilization Readiness Levels," Jan. 1, 2000.

17. For the 35 radio zones, see NYPD report,"Radio Zones," undated. For other citywide radio channels, see, e.g., NYPD report,"Transit Patrol VHF," undated; NYPD interview 18, ESU (Feb. 24, 2004).

18. For the NYPD supervising the emergency call system and employing more than 1,200 people, see NYPD report,"Communications Section," undated (online at www.nyc.gov/html/nypd/html/otsd/ commsec.html). For fire emergencies being transferred to the FDNY dispatch, see FDNY interview 28, Dispatch (Jan. 29, 2004).

19. See FDNY email to the Commission, July 9, 2004;Thomas Von Essen interview (Apr. 7, 2004). For operations being headed by the sole five-star chief, see FDNY regulations,"Regulations" chapter of "Operational Procedures and Policies," July 1999.

20. For department organization, see FDNY report,"Unit Location Chart," Sept. 11, 2001; FDNY regulations, "Firefighting Procedures,""Engine Company," and "Ladder Company Operations" chapters of "Operational Procedures and Policies," July 1999.

21. FDNY interview 48, SOC (Mar. 11, 2004).

22. FDNY interview 28, Dispatch (Jan. 29, 2004). Each center was staffed at all times with a supervisor and seven dispatchers who worked in 12-hour tours. Positions included a decision dispatcher, responsible for directing the appropriate fire apparatus to the scene; a voice alarm or notification dispatcher, responsible for intra- and interagency communications; a radio in and radio out dispatcher who tracked the movement of fire apparatuses; and three alarm dispatchers, responsible for sending the appropriate number of units to a fire scene to correspond with the designated alarm level. Ibid.

23. FDNY regulations,"Communications" chapter of "Operational Procedures and Policies," July 1999; FDNY interview 60, HQ (May 11, 2004); FDNY interview 64, HQ (June 30, 2004).

24. FDNY report,"Report from the Chief of Department,Anthony L. Fusco,"in Manning, ed., The World Trade Center Bombing, p.11.

25. PANYNJ interview 1 (Nov. 6, 2003); PANYNJ interview 4 (May 10, 2004). In early 2001, New York provided its firefighters with new digital radios.The procurement process for these radios remains controversial, and they proved unpopular with the rank and file, who believed that adequate training in their use had not been pro-vided.The new radios were withdrawn shortly after they had been introduced into the field.While the new radios briefly were in service, the WTC repeater channel could be left on at all times, because the new radios operated on entirely different frequencies and thus were not vulnerable to interference from the repeater system. Thomas Von Essen interview (Apr. 7, 2004). For the new radios permitting the repeater to stay on, see PANYNJ interview 1 (Nov. 6, 2003); PANYNJ interview 4 (May 10, 2004).

26. For civilian fatalities, see New York City press release, Office of the Mayor Press Release No. 042-01, Feb. 8, 2001. For firefighter fatalities, see Terry Golway, So Others Might Live (Basic Books, 2002), p. 304.

27. For the creation of the Office of Emergency Management (OEM), see Rudolph Giuliani interview (Apr. 20, 2004). For OEM's purposes, see Richard Sheirer interview (Apr. 7, 2004). For OEM's sending field responder, see ibid.; OEM interview 1 (Feb. 12, 2004). Other data monitored by OEM's Watch Command included Emergency Medical Service data regarding patterns of illness (to spot a potential epidemic in its early stages), live video feeds from New York Harbor and city streets, and television news channels. Richard Sheirer interview (Apr. 7, 2004); OEM interview 3 (Mar. 16, 2004). The Watch Command's monitoring of EMS data proved instrumental in an extremely early identification and then highly effective containment of the 1999 West Nile outbreak, which likely would have resulted in many more fatalities but for OEM. Richard Sheirer interview (Apr. 7, 2004).

28. Richard Sheirer testimony (May 18, 2004); OEM interview 3 (Mar. 16, 2004).

29. New York City memo,"Direction and Control of Emergencies in the City of New York," July 2001 (signed by Mayor Giuliani).

30. For the exact time of impact, see FAA analysis of American 11 radar returns and Commission analysis of FAA radar data and air traffic control software logic. For the zone of impact, see National Institute of Standards and Technology (NIST) report,"Interim Report on the Federal Building Fire Safety Investigation of the World Trade Center," June 28, 2004. On people alive on the 92nd floor and above after the impact, see Commission analysis of conditions on tower floors and advice received by civilians in the towers based on (1) calls to NYPD 911 from or concerning people in the towers on September 11, 2001, and (2) transcripts of recorded calls to the Port Authority police desk from people in the towers on September 11, 2001 (hereafter "Commission analysis of 911/PAPD calls"). Everyone alive on the 91st floor was able to evacuate. Civilian interview 7 (Mar. 22, 2004); Civilian interview 6 (Mar. 22, 2004). For civilians being alive but trapped, see Commission analysis of 911/PAPD calls; Civilian interview 17 (May 11, 2004); Civilian interview 2 (Mar. 19, 2004).

31. For fire in the 77th floor elevator and damage to the 22nd floor, see Commission analysis of 911/PAPD calls; Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel 8, p. 4 (22nd floor). For a fireball in the lobby, see PAPD interview 1,WTC Command (Oct. 14, 2003); Civilian interview 14 (Apr. 7, 2004). Burning jet fuel descended at least one elevator bank. FDNY interview 4, Chief (Jan. 8, 2004). For the roofs being engulfed and the winds, see, e.g., NYPD interview 16,Aviation (Apr. 1, 2004).

32. Commission analysis of 911/PAPD calls.

33. Ibid.

34. For the on-duty fire safety director's perspective, see WTC interview 6 (May 25, 2004). For the chiefs being told by the Port Authority fire safety director that the evacuation order was given earlier, see PANYNJ interview 13 (Nov. 20, 2003). For him no longer being the designated fire safety director, see PANYNJ interview 11 (June 23, 2004).

35. For public announcements not being heard, see, e.g., Civilian interview 6 (Mar. 22, 2004); Civilian interview 7 (Mar. 22, 2004); Civilian interview 9 (Mar. 23, 2004); Civilian interview 14 (Apr. 7, 2004); Commission analysis of 911/PAPD calls.The evacuation tone was heard in some locations below the impact. Civilian interview 7 (Mar. 22, 2004); Commission analysis of 911/PAPD calls. For some emergency intercoms being unusable, see WTC interview 9 (June 8, 2004); Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001. For evidence that some were usable, see WTC interview 6 (May 25, 2004).

36. For callers being disconnected, see Commission analysis of 911/PAPD calls. For the standard operating procedure and only a few people being available, causing calls to be transferred, see FDNY interview 28, Dispatch (Jan. 29, 2004). For delays and terminations, see Commission analysis of 911/PAPD calls.

37. For operators' and dispatchers' situational awareness and instructions to callers, see Commission analysis of 911/PAPD calls. For standard operating procedures for a high-rise fire, see FDNY interview 28, Dispatch (Jan. 29, 2004). For the fire chiefs' view, see FDNY interview 61, Chief (May 12, 2004); FDNY interview 62, Chief (May 12, 2004). For many injuries occurring during the evacuation, see Zachary Goldfarb and Steven Kuhr, "EMS Response to the Explosion," in Manning, ed., The World Trade Center Bombing, p. 94.

38. FDNY interview 15, Chief (Jan. 14, 2004): FDNY interview 4, Chief (Jan. 8, 2004).

39. For operators' and dispatchers' lack of knowledge, see Commission analysis of 911/PAPD calls. For operators departing from protocol, see ibid.

40. Commission analysis of 911/PAPD calls; Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel 9, pp. 1-2, 23-24; channel 10, pp. 2, 6, 23.

41. See Civilian interview 6 (Mar. 22, 2004); Civilian interview 7 (Mar. 22, 2004); Civilian interview 14 (Apr. 7, 2004); Civilian interview 9 (Mar. 23, 2004). For Port Authority employees remaining, see Civilian interview 6 (Mar. 22, 2004); Civilian interview 7 (Mar. 22, 2004), Port Authority report, September 11 Special Awards Ceremony, vol. 1, undated (recognitions 2, 3, 4, and 5).

42. For trouble reaching exits, see, e.g., Civilian interview 9 (Mar. 23, 2004). For "locked" doors, see, e.g., Civilian interview 6 (Mar. 22, 2004); Civilian Interview 14 (Apr. 7, 2004); WTC interview 9 (June 8, 2004); Civilian interview 7 (Mar. 22, 2004).

43. For smoke rising and its effect, see Commission analysis of 911/PAPD calls. For people jumping, see Civilian interview 13 (Mar. 25, 2004); Commission analysis of 911/PAPD calls; Port Authority transcripts of recorded Port Authority calls and radio channels, vol. II,WTC channel 26 (channel W), Sept. 11, 2001, pp. 4-6.

44.There is no evidence of a dispute between Morgan Stanley and the Port Authority over the Port Author-ity's "defend in place" evacuation policy before September 11. For occupants who were unaware of what happened, see, e.g., Civilian interview 1 (Mar. 2, 2004). For civilians concluding that the incident had occurred in the other building, see Civilian interview 13 (Mar. 25, 2004); Civilian interview 1 (Mar. 2, 2004). For others being aware that a major incident had occurred, see, e.g., Civilian interview 13 (Mar. 25, 2004); Civilian interview 10 (Mar. 24, 2004). Some of them could actually feel the heat from the explosion in the North Tower. See, e.g., Civilian interview 10 (Mar. 24, 2004); Civilian interview 15 (Apr. 21, 2004). For people deciding to leave or being advised to do so by fire wardens, see, e.g., Civilian interview 1 (Mar. 2, 2004); Civilian interview 8 (Mar. 23, 2004); Civilian statement 1, undated. For Morgan Stanley occupying 20 floors and ordering its employees to leave, see Civilian interview 19 (June 6, 2004).

45. Port Authority, transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel 17, p. 1; PANYNJ interview 7 (June 2, 2004). Fire command stations were equipped with manuals containing prescripted announcements corresponding to a number of specified emergencies. Once the FDNY arrived on the scene, however, all decisions relating to evacuation or other emergency procedures were left to its discretion.

46. When a notable event occurred, it was standard procedure for the on-duty deputy fire safety director to make an "advisory" announcement to tenants who were affected by or might be aware of the incident, in order to acknowledge the incident and to direct tenants to stand by for further instructions. The purpose of advisory announcements, as opposed to "emergency" announcements (such as to evacuate), was to reduce panic. PANYNJ interview 7 (June 2, 2004); Port Authority response to Commission interrogatory, May 2004. For the content of the announcement, see, e.g., Brian Clark testimony, May 18, 2004 (videotaped); Civilian interview 3 (May 4, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian statement 1, undated. For the protocol and prescripted announcements and the death of the director of fire safety and the deputy fire safety director, see PANYNJ interview 7 (June 2, 2004); PANYNJ interview 12 (July 7, 2004). For people not thinking a second plane would hit, see, e.g., PANYNJ interview 7 (June 2, 2004). For the quotation, see FDNY interview 63, Chief (May 16, 2004). For civilians remaining, see Civilian interview 1 (Mar. 2, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian interview 8 (Mar. 23, 2004); Civilian interview 16 (Apr. 27, 2004); Commission analysis of letters written to OSHA concerning the September 11 attacks. For civilians returning after evacuating, see Civilian interview 1 (Mar. 2, 2004); Civilian interview 11 (Mar. 25, 2004); Civilian interview 4 (Mar. 16, 2004); Commission analysis of letters written to OSHA concerning the September 11 attacks.

47. For advice on the ground floor, see Civilian interview 4 (Mar. 16, 2004). Nineteen of them returned upstairs, where 18 died; the 20th was told by her supervisor, who was in the group, to leave rather than return upstairs.The supervisor also survived. Civilian interview 4 (Mar. 16, 2004). For advice in the sky lobbies, see, e.g., Civilian interview 15 (Apr. 21, 2004). For security officials not being part of the fire safety staff, see PANYNJ interview 7 (June 2, 2004).

48. For people told to stand by, see Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel 8, pp. 7-8. For people advised to leave, see ibid., vol. II, channel 9, pp. 2, 4, 9.

49. It is also not known if the deputy fire safety director received the order by the PAPD to evacuate the complex; however, the Port Authority has told us that deputy fire safety directors did not generally take direct orders from the PAPD under the regular chain of command. PANYNJ interview 7 (June 2, 2004). For the announcement, see Civilian interview 16 (Apr. 27, 2004); Civilian interview 13 (Mar. 25, 2004). For the announcement's deviating from protocol, see PANYNJ interview 7 (June 2, 2004).

50. For senior leaders' response by 9:00 A.M., see FDNY interview 18, Chief (Jan. 22, 2004); FDNY interview 54, Chief (Apr. 15, 2004); FDNY interview 5, Chief (Dec. 16, 2003); FDNY interview 52, Chief (Apr. 5, 2004); FDNY interview 27, HQ (Jan. 28, 2004). For the Chief of Department's and Chief of Operation's actions, see FDNY interview 18, Chief (Jan. 22, 2004). For senior leaders' response by 9:59, see FDNY report, McKinsey & Company, "FDNY Report,"Aug. 19, 2002, p. 32.

51. FDNY interview 60, HQ (May 11, 2004); see FDNY record, computer-aided dispatch report, Sept. 11, 2001, 08:47:20-9:00:00.

52. For the chief 's and companies' arrival, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001; FDNY interview 4, Chief (Jan. 8, 2004). For burned civilians, see FDNY interview 29, Battalion 1 (Jan. 29, 2004). For the building's physical conditions, see FDNY interview 16, Battalion 1 (Jan. 20, 2004). For conditions in the lobby, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001.

53. For the initial incident commander and command post location, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001; FDNY interview 4, Chief (Jan. 8, 2004). For the transfer of incident command, see FDNY interview 15, Chief (Jan. 14, 2004). For ascertaining building systems' status from building personnel, see FDNY interview 4, Chief (Jan. 8, 2004); PANYNJ interview 13 (Nov. 20, 2003); FDNY interview 15, Chief (Jan. 14, 2004). For speaking with OEM and PAPD officials, see FDNY interview 15, Chief (Jan. 14, 2004); Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001.

54. For the ladder and engine companies' climb, see FDNY interview 59, Battalion 2 (Apr. 22, 2004); Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001. For tactical 1, see FDNY interview 59, Battalion 2 (Apr. 22, 2004). For other units lining up in the lobby, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001.

55. For FDNY instructing building personnel and PAPD to evacuate the South Tower, see FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 15, Chief (Jan. 14, 2004); PANYNJ interview 13 (Nov. 20, 2003). For lack of concern about a second plane, see FDNY interview 63, Chief (May 16, 2004).

56. FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 15, Chief (Jan. 14, 2004).

57. For their situational awareness, see FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 15, Chief (Jan. 14, 2004) (quotation).

58. Peter Hayden testimony, May 18, 2004 (videotaped).

59. On the lack of information, see FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 15, Chief (Jan. 14, 2004).

60. On the staging areas, see FDNY interview 47, Chief (Mar. 11, 2004); FDNY interview 44, Chief (Mar. 8, 2004); FDNY interview 33, EMS (Feb. 9, 2004). For EMS's response, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001. For private ambulances responding, see FDNY interview 35, EMS (Feb. 10, 2004).

61. NYPD recordings, City Wide 1, Special Operations Division, and Divisions 1, 2, and 3 radio channels, Sept. 11, 2001.

62. For the Chief of Department's actions, see NYPD interview 8, HQ (Feb. 24, 2004). For the number of officers, see NYPD regulations,"Patrol Guide: Rapid Mobilization," Jan. 1, 2000; NYPD recordings, City Wide 1 and Divisions 1, 2, and 3 radio channels, Sept. 11, 2001.

63. For shifting the mobilization point, see NYPD interview 17, 1st Precinct (Apr. 1, 2004). For stationing officers around the perimeter, see NYPD recordings, City Wide 1, Special Operations Division, and Divisions 1, 2, and 3 radio channels, Sept. 11, 2001. For officers being diverted, see, e.g., NYPD interview 21, 6th Precinct (May 4, 2004).

64. For the helicopters' dispatch, see NYPD records, "Aviation Unit Flight Data Sheets," Sept. 11, 2001. For communications with air traffic controllers and their situational awareness, see NYPD interview 12,Aviation (Mar. 10, 2004); NYPD interview 14, Aviation (Mar. 11, 2004); NYPD interview 13, Aviation (Mar. 10, 2004); NYPD interview 16, Aviation (Apr. 1, 2004).

65. NYPD recording, Special Operations Division radio channel, Sept. 11, 2001.

66. For the third helicopter, see NYPD records,"Aviation Unit Flight Data Sheets," Sept. 11, 2001. For the helicopters' subsequent actions and protocol, see NYPD interview 12,Aviation (Mar. 10, 2004); NYPD interview 14, Aviation (Mar. 11, 2004); NYPD interview 13, Aviation (Mar. 10, 2004); NYPD interview 16, Aviation (Apr. 1, 2004); NYPD interview 15, ESU (Mar. 11, 2004).

67. Commission analysis of 911/PAPD calls; NYPD recordings, City Wide 1, Special Operations, and Division 1, 2, and 3 radio channels, Sept. 11, 2001.

68. NYPD memo, requests for departmental recognition 4 and 6, Jun. 26, 2002. For those on the 22nd floor apparently not being located, see PANYNJ recognition 1, undated.

69. NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004).

70. For other officers' positioning, see NYPD interview 20, Manhattan South Task Force (May 4, 2004); NYPD interview 21, 6th Precinct (May 4, 2004); NYPD interview 19, 13th Precinct (May 4, 2004); NYPD interview 4, Housing (Feb. 17, 2004); PAPD interview 4, Port Authority Bus Terminal Command (Nov. 20, 2003). For officers assisting in the North Tower evacuation, see NYPD memo, request for departmental recognition 1 and 2, June 26, 2002.

71. NYPD recording,Transit Division 1 radio channel, Sept. 11, 2001.

72. NYPD recordings, City Wide 1, Special Operations Division, and Divisions 1, 2, and 3 radio channels, Sept. 11, 2001.

73. For the on-site commanding officer's actions, see PAPD interview 1,WTC command (Oct. 14, 2003). For the on-duty sergeant's initial instructions, see PAPD statement 3,WTC Command (Nov. 12, 2001). For his instructions to meet at the desk, see PAPD statement 3, WTC Command (Nov. 12, 2001); PAPD statement 12, WTC Command (Mar. 28, 2002). On the scarcity of radios, see PAPD statement 9, PATH Command (Jan. 28, 2002); PAPD statement 8,WTC Command (Jan. 12, 2002).

74. PAPD interview 7,WTC Command (Nov. 25, 2003).

75. For the response, see PAPD statement 2,WTC Command (Nov. 10, 2001). For the lack of such written standard operating procedures, see PAPD interview 3, LaGuardia Airport Command (Nov. 20, 2003); PAPD reg-ulations,"Manual of Police Division Instructions," undated (in existence before 9/11). Instead, the PAPD relied on tradition to dictate its response procedures. On the lack of interoperable frequencies, see PANYNJ interview 4 (May 10, 2004); PAPD statement 9, PATH Command (Jan. 28, 2002).

76. For the evacuation order, see PAPD statement 3, WTC Command (Nov. 12, 2001); PAPD interview 1, WTC Command (Oct. 14, 2003). For its transmission, see Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel W, p. 7.

77. PAPD statement 1,Administrative Command, Nov. 2, 2001; PAPD statement 4,Administrative Command, Nov. 24, 2001.

78. For the Emergency Operations Center's activation, see OEM interview 3 (Mar. 16, 2004); OEM interview 2 (Mar. 4, 2004). For the request for search teams, see OEM interview 5 (Mar. 19, 2004). For the senior OEM offi

cial's arrival, see OEM interview 4 (Mar. 18, 2004). For other OEM officials' arrival, see Richard Sheirer interview (Apr. 7, 2004); OEM interview 6 (Mar. 24, 2004).

79. For the time of impact, see FAA analysis of United Airlines Flight 175 radar returns and Commission analysis of FAA radar data and air traffic control software logic. For the impact zone, see NIST report,"Interim Report on the Federal Building and Fire Safety Investigation of the World Trade Center," June 18, 2004, appendix H-41. For portions undamaged, see Civilian interview 10 (Mar. 24, 2004). For stairwell A remaining passable, see Civilian interview 8 (Mar. 23, 2004); Civilian interview 1 (Mar. 2, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian interview 4 (Mar. 16, 2004).

80. For the sky lobby, see Civilian interview 10 (Mar. 24, 2004). For the condition of people on the impact floors, see Civilian interview 10 (Mar. 24, 2004); Civilian interview 4 (Mar. 16, 2004); Commission analysis of 911/PAPD calls. For events in the sky lobby after impact, see Civilian interview 10 (Mar. 24, 2004).

81. For conditions in the impact zone above the 78th floor, see Civilian interview 4 (Mar. 16, 2004); Civilian interview 3 (May 4, 2004); Commission analysis of 911/PAPD calls. For conditions on the 81st floor, see Civilian interview 4 (Mar. 16, 2004); Civilian interview 3 (May 4, 2004).

82. For the four people, see Civilian interview 1 (Mar. 2, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian interview 4 (Mar. 16, 2004); Civilian interview 8 (Mar. 23, 2004). For the first person to descend stairwell A, see Civilian interview 13 (Mar. 25, 2004).

83. For civilians ascending the stairs, see Civilian interview 8 (Mar. 23, 2004); Civilian interview 16 (Apr. 27, 2004); Civilian interview 1 (Mar. 2, 2004); Commission analysis of letters written to OSHA concerning the September 11 attacks. For the intention of the group ascending the stairwell and the conditions, see Civilian interview 8 (Mar. 23, 2004).

84. On civilians finding locked doors, see, e.g., Civilian interview 16 (Apr. 27, 2004); Commission analysis of letters written to OSHA concerning the September 11 attacks. On the lock release order, see Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel X, pp. 25-31; Port Authority response to Commission interrogatory, May 2004.The Security Command Center did not control access areas in the Observation Deck and other private tenant spaces. It is unknown whether there were any prior or subsequent orders or attempts to release the building's locks.

85. For trouble descending, see Brian Clark testimony, May 18, 2004 (videotaped); Richard Fern testimony, May 18, 2004 (videotaped); Commission analysis of letters written to OSHA concerning the September 11 attacks. The conditions of stairwell C are unknown. For conditions in stairwells, see, e.g., Civilian Interview 1 (Mar. 2, 2004); Civilian Interview 13 (Mar. 25, 2004).

86. For some civilians remaining, see Civilian interview 10 (Mar. 24, 2004). For some civilians ascending, see, e.g., Civilian interview 1 (Mar. 2, 2004); Civilian interview 11 (Mar. 25, 2004).

87. For conditions in the 90s and 100s, see Commission analysis of 911/PAPD calls. For the 105th floor and the condition of the less affected area, see Civilian interview 16 (Apr. 27, 2004). For the other areas of the 105th, 88th, and 89th floors, see Commission analysis of 911/PAPD calls.

88. For the callers, see Commission analysis of 911/PAPD calls.There are many variables to consider in determining whether, and to what extent, stairwell A was actually a viable exit. Knowing that the stairway was initially passable from at least the 91st floor down, we can conclude that it was likely open from top to bottom, on floors farther removed from the impact. However, in areas near the impact zone some doors leading to the stairwell may have jammed.We know that access to stairway A was possible from at least the 81st and 84th floors, and from several other floors between the 84th and 91st floor. It is likely that access was possible from floors higher up as well. It is not known, however, whether 911 callers had a clear path to the stairwell entrance from their locations. Damage caused by the impact of the plane, and the resulting smoke and heat, may have prevented some from being able to reach the entrance to the staircase; but the stated locations of at least some callers indicate that they were near stairwell A on their floor. Based on conditions described by civilians who descended stairwell A from at or above the impact zone, we conclude that stairwell A may have become effectively impassable as the morning progressed.

89. Commission analysis of 911/PAPD calls.

90. Brian Clark testimony, May 18, 2004 (videotaped); Civilian interview 1 (Mar. 2, 2004); Commission analysis of 911/PAPD calls.

91. Commission analysis of 911/PAPD calls.

92. Civilian interview 1 (Mar. 2, 2004); Civilian interview 8 (Mar. 23, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian interview 4 (Mar. 16, 2004); Commission analysis of 911/PAPD calls.

93. OEM interview 1 (Feb. 12, 2004); PANYNJ interview 7 (June 2, 2004); Civilian interview 13 (Mar. 25, 2004); Civilian interview 1 (Mar. 2, 2004); Civilian interview 8 (Mar. 23, 2004).

94. Civilian interview 8 (Mar. 23, 2004); Civilian interview 1 (Mar. 2, 2004); Civilian interview 4 (Mar. 16, 2004); Civilian interview 13 (Mar. 25, 2004); NYPD interview 15, ESU (Mar. 11, 2004).

95. Civilian interview 6 (Mar. 22, 2004); Civilian interview 7 (Mar. 22, 2004) (quotation); Civilian interview 9 (Mar. 3, 2004); Civilian interview 14 (Apr. 7, 2004).

96. Commission analysis of 911/PAPD calls. It is not clear whether callers from below the impact were trapped in offices or otherwise obstructed from proceeding, or were simply calling to seek advice. In any case, the 911 operators and FDNY dispatchers who advised them did not appear to be basing their advice on these or other factual considerations.

97. Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001.

98. For the evacuation route for civilians, see Civilian interview 6 (Mar. 22, 2004); Civilian interview 7 (Mar. 22, 2004); Civilian interview 14 (Apr. 7, 2004); Civilian interview 9 (Mar. 23, 2004); PANYNJ interview 7 (Jun. 2, 2004).

99. FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 16, Battalion 1 (Jan. 20, 2004); FDNY interview 24, Battalion 6 (Jan. 23, 2004); FDNY interview 29, Battalion 1 (Jan. 29, 2004); NYPD interview 6, ESU (Feb. 19, 2004); NYPD interview 10, ESU (Mar. 1, 2004); FDNY interview, transcript 10, Battalion 2, Dec. 6, 2001.

100. Civilian interview 7 (Mar. 22, 2004); Civilian interview 6 (Mar. 22, 2004); PAPD interview 4, Port Authority Bus Terminal Command (Nov. 20, 2003); NYPD interview 10, ESU (Mar. 1, 2004). For people killed by debris, see, e.g.,WTC interview 9 (June 8, 2004).

101. FDNY records, computer-aided dispatch report, alarm box 8087, Sept. 11, 2001, 09:10:02; FDNY interview 45, HQ (Mar. 8, 2004).

102. For the 23 engines and 13 ladders dispatched, see FDNY records, computer-aided dispatch report, Sept. 11, 2001, 09:08:28-09:15:00. For units that self-dispatched, see FDNY interview 60, HQ (May 11, 2004); FDNY report, McKinsey & Company,"FDNY Report,"Aug. 19, 2002, p. 35. For units riding heavy, see ibid., p. 131; FDNY interview 25, Battalion 1 (Jan. 23, 2004); FDNY interview 21, Battalion 1 (Jan. 22, 2004); FDNY interview 7, Battalion 4 (Jan. 9, 2004); FDNY interview 9, Battalion 8 (Jan. 9, 2004); FDNY interview 50, Battalion 11 (Mar. 17, 2004); FDNY interview 31, Battalion 1 (Jan. 30, 2004); FDNY interview 34, Battalion 1 (Feb. 9, 2004). For extra personnel being a particular issue for SOC companies, see FDNY report, 9/11 fatalities list. For firefighters responding when told not to, see FDNY interview 46, Battalion 10 (Mar. 9, 2004). For firefighters responding from firehouses separately from the on-duty unit, see FDNY interview 46, Battalion 10 (Mar. 9, 2004); FDNY interview, transcript 26, Battalion 2, Jan. 16, 2002; FDNY interview, transcript 14, Battalion 32, Dec. 12, 2001; FDNY interview, transcript 19, Battalion 2, Jan. 8, 2002. For firefighters responding from home, see FDNY interview 14, Battalion 1 (Jan. 13, 2004); FDNY interview 17, Battalion 6 (Jan. 22, 2004); FDNY interview 19, Battalion 4 (Jan. 22, 2004); FDNY interview, transcript 6, Battalion 6 (Oct. 12, 2001); FDNY interview 11, Battalion 1 (Jan. 13, 2004); FDNY interview, transcript 2, Battalion 2, Oct. 9, 2001. For numerous additional FDNY personnel reporting, see FDNY interview 3, Chief (Jan. 7, 2004); FDNY interview 8, Fire Marshall (Jan. 9, 2004).

103. FDNY interview 15, Chief (Jan. 14, 2004); Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001.

104. For FDNY personnel requesting the repeater's activation, see FDNY interview 4, Chief (Jan. 8, 2004). For one button on the repeater channel being activated, see PANYNJ interview 1 (Nov. 6, 2003); PANYNJ interview 4 (May 10, 2004); Port Authority records, measurements of repeater activation tones on Sept. 11, 2001, undated. For it being unclear who triggered activation, see WTC interview 6 (May 25, 2004). For the mechanics of activating the repeater, see PANYNJ interview 1 (Nov. 6, 2003); PANYNJ interview 4 (May 10, 2004).

105. For the testing of the repeater system, see Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001. For the master handset not being able to transmit, see PANYNJ interview 1 (Nov. 6, 2003); PANYNJ interview 4 (May 10, 2004); Port Authority records, measurements of repeater activation tones on Sept. 11, 2001, undated. For the chief on the handset not being able to hear, see Port Authority recording, WTC channel 30 (repeater channel), Sept. 11, 2001. On why he could not hear, see PANYNJ interview 1 (Nov. 6, 2003); PANYNJ interview 4 (May 10, 2004). For the repeater channel being in use in the South Tower, see Port Authority record-ing,WTC channel 30 (repeater channel), Sept. 11, 2001.

106. FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 5, Chief (Dec. 16, 2003). For the quotation, see Joseph Pfeifer testimony, May 18, 2004 (videotaped).

107. Peter Hayden testimony, May 18, 2004 (videotaped).

108. FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 5, Chief (Dec. 16, 2003).

109. On units ascending to the impact zone, see, e.g., FDNY interview 16, Battalion 1 (Jan. 20, 2004); FDNY interview 40, Battalion 4 (Feb. 12, 2004). On tasks below the impact zone, see FDNY interview 9, Battalion 8 (Jan. 9, 2004); FDNY interview, transcript 16, Battalion 31, Dec. 20, 2001. For rescuing civilians on the 22nd floor, see PANYNJ recognition 1, undated.

110. See FDNY interview 58, Division 3 (Apr. 22, 2004). For units using tactical 1, see FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 23, Chief (Jan. 23, 2004).

111. See FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 16, Battalion 1 (Jan. 20, 2004); Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001. For equipment being carried, see ibid.

112. FDNY interview 38, Battalion 4 (Feb. 11, 2004). For the working elevator, see FDNY interview 23, Chief (Jan. 23, 2004).

113. FDNY interview 38, Battalion 4 (Feb. 11, 2004); FDNY interview 25, Battalion 1 (Jan. 23, 2004); FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 24, Battalion 6 (Jan. 23, 2004); FDNY interview 10, Battalion 1 (Jan. 12, 2004); FDNY interview 20, Battalion 6 (Jan. 22, 2004).

114. FDNY interview 23, Chief (Jan. 23, 2004); FDNY interview 30, Battalion 4 (Jan. 30, 2004); FDNY interview 13, Battalion 1 (Jan. 13, 2004); FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 26, Battalion 8 (Jan. 28, 2004).

115. FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 20, Battalion 6 (Jan. 22, 2004); FDNY interview 16, Battalion 1 (Jan. 20, 2004); FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 13, Battalion 1 (Jan. 13, 2004); NYPD interview 6, ESU (Feb. 19, 2004); FDNY interview 23, Chief (Jan. 23, 2004); FDNY interview 25, Battalion 1 (Jan. 23, 2004).

116. For the instruction to return to the lobby, see FDNY interview 5, Chief (Dec. 16, 2003); Jules Naudet and Gedeon Naudet video footage, Sept. 11, 2001. For the rumor being debunked, the other chief continuing operations, and no evidence of units returning, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001; FDNY interview 15, Chief (Jan. 14, 2004). For the chief in lobby asked about helicopters, see FDNY interview, transcript 7, Chief, Oct. 23, 2001. For the rejection of helicopters, see Rudolph Giuliani interview (Apr. 20, 2004).

117. For the diminished communications, see FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview, transcript 5, Battalion 6 (Oct. 12, 2001); FDNY interview 42, Field Comm (Feb. 13, 2004); Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001; FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 5, Chief (Dec. 16, 2003). For lobby chiefs hearing nothing in response, see FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 5, Chief (Dec. 16, 2003).

118. For firefighters on the 54th floor, see NYPD interview 23, Intelligence (June 10, 2004). For firefighters on the 44th floor, see PAPD interview 7,WTC Command (Nov. 25, 2004). For firefighters between the 5th and 37th floors, see, e.g., FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 40, Battalion 4 (Feb. 12, 2004).

119. For their commencing operations, see Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001. For OEM field responder joining, see OEM interview 1 (Feb. 12, 2004). For units not rerouting to South Tower, see OEM interview 1 (Feb. 12, 2004); Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001; FDNY interview, transcript 4, Battalion 4, Oct. 9, 2001; FDNY interview, transcript 20, Battalion 10 (Jan. 10, 2001).

120. For the ladder company in stairwell B, see Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001. For the other ladder company, see OEM interview 1 (Feb. 12, 2004). For the senior chief 's perspective, see Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001.

121. Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001.

122. For the chiefs' situational awareness, see Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001; FDNY interview 4, Chief (Jan. 8, 2004); FDNY 15, Chief (Jan. 14, 2004); FDNY interview 43, Chief (Mar. 3, 2004). For the senior chief 's perspective, see Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001.

123. Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001. It is unknown whether the lobby chief ceased to communicate on the repeater channel because of technical problems or because he simply switched channels in order to be able to communicate with chiefs outside the South Tower.The FDNY strongly maintains that there must have been a technical problem resulting from the impact of one of the planes, because they do not believe this chief would have switched channels without first so advising on the repeater channel. FDNY letter to the Commission, July, 2, 2004. However, the repeater channel subsequently worked very well for FDNY personnel on the 78th floor and in an elevator on the 40th floor. Port Authority recording, WTC channel 30 (repeater channel), Sept. 11, 2001.

124. FDNY interview 37, Battalion 35 (Feb. 10, 2004); FDNY interview 2, Battalion 48 (Dec. 15, 2003); FDNY interview, transcript 11, Battalion 32, Dec. 12, 2001.

125. On the need for more companies, see FDNY interview 6, HQ (Jan. 8, 2004). For only two units being dispatched, see OEM interview 1 (Feb. 12, 2004); Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001; FDNY interview, transcript 4, Battalion 4, Oct. 9, 2001; FDNY interview, transcript 20, Battalion 10, Jan. 10, 2001. For the delayed dispatch, see FDNY records, computer-aided dispatch report, alarm box 8087, Sept. 11, 2001, 09:03:00-09:10:02. For units staged at the Brooklyn-Battery tunnel, see ibid., alarm box 1377, Sept. 11, 2001, 08:52:59-09:47:05. On units who parked and walked, see FDNY interview 46, Battalion 10 (Mar. 9, 2004); FDNY interview, transcript 24, Battalion 35, Jan. 25, 2002; FDNY interview, transcript 22, Battalion 7, Jan. 16, 2002. For confusion about the towers, see FDNY interview, transcript 8, Chief, Oct. 23, 2001; Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001. On the inability to find the staging area, see FDNY interview 2, Battalion 48 (Dec. 15, 2003); FDNY interview, transcript 17, Battalion 12, Dec. 20, 2001. On jumpers and debris, see FDNY interview 2, Battalion 48 (Dec. 15, 2003); FDNY interview 22, Battalion 28 (Jan. 22, 2004); FDNY interview 39, Battalion 35 (Feb. 11, 2004); FDNY interview, transcript 11, Battalion 32, Dec. 12, 2001; FDNY interview, transcript 15, Battalion 48, Dec. 13, 2001; FDNY interview, transcript 17, Battalion 12, Dec. 20, 2001.

126. For the chief 's perspective, see FDNY interview 43, Chief (Mar. 3, 2004). For the four companies, see FDNY interview, transcript 13, Battalion 11, Dec. 12, 2001.

127. FDNY interview 43, Chief (Mar. 3, 2004). For finding working elevator in North Tower, see FDNY interview 53, Battalion 11 (Apr. 14, 2004).

128. For the second alarm, see FDNY interview 6, HQ (Jan. 8, 2004). For the other units, see FDNY records, computer-aided dispatch report, alarm box 1377, Sept. 11, 2001, 09:42:45-09:47:05. For some having gone through the tunnel and responded to the Marriott, see FDNY interview, transcript 15, Battalion 48, Dec. 13, 2001.

129. Port Authority recording,WTC channel 30 (repeater channel), Sept. 11, 2001.

130. FDNY interview 42, Field Comm (Feb. 13, 2004); FDNY interview 45, HQ (Mar. 8, 2004); FDNY interview 46, Battalion 10 (Mar. 9, 2004); FDNY interview 18, Chief (Jan. 22, 2004); FDNY interview 27, HQ (Jan. 28, 2004); FDNY interview 47, Chief (Mar. 11, 2004); OEM interview 6 (Mar. 24, 2004).

131. FDNY interview 42, Field Comm (Feb. 13, 2004).

132. Ibid.

133. FDNY interview 27, HQ (Jan. 28, 2004).

134. For no chief fearing a total collapse, see FDNY interview 45, HQ (Mar. 8, 2004);Thomas Von Essen interview (Apr. 7, 2004); FDNY interview 52, Chief (Apr. 5, 2004); FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 5, Chief (Dec. 16, 2003). For one chief's perspective, see FDNY interview 52, Chief (Apr. 5, 2004). For the opinion not being conveyed, see FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 15, Chief (Jan. 14, 2004); FDNY interview 5, Chief (Dec. 16, 2003).

135. FDNY interview 5, Chief (Dec. 16, 2003).

136. For the fifth alarm, see FDNY records, computer-aided dispatch report, alarm box 2033, Sept. 11, 2001, 09:54:29. On numbers dispatched, see ibid., Sept. 11, 2001, 08:47:20-09:54:29. For the paramedic, see FDNY interview 32, Chief (Feb. 9, 2004).

137. NYPD interview 8, HQ (Feb. 24, 2004). Each Level 4 mobilization fields about 1,000 officers.

138. NYPD interview 8, HQ (Feb. 24, 2004).

139. NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004).

140. For the ESU team's arrival in the North Tower and attempt to talk with the FDNY chiefs without OEM intervention, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001; NYPD interview 5, ESU (Feb. 19, 2004); NYPD interview 6, ESU (Feb. 19, 2004). For the decision to have the ESU team ascend, see NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004). For the first ESU team in the South Tower checking in with the FDNY command post there, see OEM interview 1 (Feb. 12, 2004).

141. For the ESU teams' preparations and one team entering the South Tower, see NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004). For the fifth team's status at 9:59, see NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004); NYPD interview 7, ESU (Feb. 20, 2004). For the team at the North Tower, see NYPD interview 11, ESU (Mar. 9, 2004); NYPD interview 10, ESU (Mar. 1, 2004).

142. NYPD interview 6, ESU (Feb. 19, 2004).

143. New York City Police Museum interview of Kenneth Winkler,Apr. 17, 2003 (videotaped); NYPD interview 15, ESU (Mar. 11, 2004).

144. NYPD interview 22, Intelligence (June 10, 2004); NYPD interview 23, Intelligence (June 10, 2004); NYPD interview 24, Intelligence (June 15, 2004).

145. NYPD interview 20, Manhattan South Task Force (May 4, 2004); NYPD interview 21, 6th Precinct (May 4, 2004); NYPD interview 19, 13th Precinct (May 4, 2004); NYPD interview 4, Housing (Feb. 17, 2004); PAPD interview 4, Port Authority Bus Terminal Command (Nov. 20, 2003).

146. NYPD interview 19, 13th Precinct (May 4, 2004); NYPD interview 2,Transit (Jan. 2, 2004).

147. For the instructions to civilians, see NYPD interview 3, HQ (Jan. 15, 2004). For the officers at 5 WTC and the concourse, see NYPD memo, requests for departmental recognition 3 and 5, June 26, 2002; NYPD memo, request for departmental recognition 3, June 26, 2002. For officers in the South Tower, see NYPD memo, request for departmental recognition 6, June 26, 2002; NYPD memo, request for departmental recognition 4, June 26, 2002.

148. For the Chief of Department's instructions, see NYPD interview 8, HQ (Feb. 24, 2004). For the heli-copter's perspective, see NYPD recordings, City Wide 1 and Special Operations Division radio channels, Sept. 11, 2001. For pilot's belief and the helicopter not hovering, see NYPD interview 12,Aviation (Mar. 10, 2004). For the other helicopter, see NYPD interview 16, Aviation (Apr. 1, 2004); NYPD interview 1, Aviation (Sept. 26, 2003).

149. For the warning, see NYPD recording, Special Operations Division radio channel, Sept. 11, 2001. For no pilot predicting a collapse, see, e.g., NYPD interview 12, Aviation (Mar. 10, 2004); NYPD interview 14, Aviation (Mar. 11, 2004).

150. For the 911 call, see Commission analysis of 911/PAPD calls. For the inaccurate conveyance, see NYPD report, McKinsey & Company,"NYPD Call-routing and Message Dispatch: Draft Summary Report," July 23, 2002.

151. For the initial responders and the assignments, see PAPD statement 3,WTC Command, Nov. 12, 2001; PAPD statement 12,WTC Command, Mar. 28, 2002. For officers assigned to rescue, see Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel W, p. 26. For others climbing toward the impact zone, see PAPD statement 4, Administration Command, Nov. 24, 2001.

152. For the PAPD Superintendent and inspector's ascent, see PAPD statement 3,WTC Command, Nov. 12, 2001. For the PAPD Chief 's and officers' ascent, see PANYNJ statement 1, Feb. 1, 2002. For the calls to the PAPD desk, see Port Authority transcripts of recorded Port Authority calls and radio channels, Sept. 11, 2001, vol. II, channel 10, pp. 16-17.

153. For officers responding on their own initiative, see PAPD interview 8, JFK Command (Mar. 31, 2004); PAPD statement 11, WTC Command, Mar. 28, 2002. For the desk's instructions, see PAPD statement 10, Port Authority Bus Terminal Command, Mar. 20, 2002; PAPD interview 3, LaGuardia Command (Nov. 20, 2003). For formulating an ad hoc plan, see PAPD interview 3, LaGuardia Command (Nov. 20, 2003); PAPD statement 6, Port Authority Bus Terminal Command, Jan. 4, 2002. For poor situational awareness, see PAPD statement 7, Administrative Command, Jan. 6, 2002; PAPD interview 8, JFK Command (Mar. 31, 2004). For the lack of equipment, see PAPD interview 9, LaGuardia Command (Apr. 1, 2004); PAPD statement 13, Port Newark Command, Mar. 5, 2002.

154. On the PAPD officer reaching the 44th floor, see PAPD interview 7,WTC Command (Nov. 25, 2003). For the PAPD teams, see PAPD, statement 4, Administrative Command, Nov. 24, 2001; PAPD interview 1,WTC Command (Oct. 14, 2003). For the officers climbing, see PAPD statement 3,WTC Command, Nov. 12, 2001. For officers on the ground floors, see PAPD interview 4, Port Authority Bus Terminal Command (Nov. 20, 2003); PAPD interview 2, Holland Tunnel Command (Oct. 27, 2003); PAPD statement 2,WTC Command, Nov. 10, 2001.

155. On remaining in the bunker, see OEM interview 3 (Mar. 16, 2004). For the evacuation order, see OEM interview 4 (Mar. 18, 2004). On liaisons and OEM, see OEM interview 3 (Mar. 16, 2004). For field responders' placement, see OEM interview 6 (Mar. 24, 2004); OEM interview 1 (Feb. 12, 2004); Richard Sheirer interview (Apr. 7, 2004); OEM interview 7 (Mar. 31, 2004); FDNY interview, transcript 25, OEM, Oct. 17, 2001.

156. NIST report,"Progress Report on the Federal Building and Fire Safety Investigation of the WTC," June 18, 2004, appendix H, p. 40.

157. For information about 911 calls, see Commission analysis of 911/PAPD calls. For people alive on the 92nd and 79th floors, see ibid.; Civilian interview 5 (May 26, 2004). For civilians being assisted, see PAPD interview 4, Port Authority Bus Terminal Command (Nov. 6, 2004); NYPD interview 10, ESU (Mar. 1, 2004); FDNY interview, transcript 10, Battalion 2, Dec. 6, 2001. For injured civilians being assisted, see FDNY interview, transcript 10, Battalion 2, Dec. 6, 2001; FDNY interview 40, Battalion 4 (Feb. 12, 2004); PAPD interview 6, Lincoln Tunnel Command (Nov. 24, 2003).

158. For the overall command post, see FDNY interview 52, Chief (Apr. 5, 2004). For the North Tower lobby, see FDNY interview 4, Chief (Jan. 8, 2004). For South Tower staging, see FDNY interview 6, HQ (Jan. 8, 2004). For EMS staging areas, see FDNY interview 32, Chief (Feb. 9, 2004); FDNY interview 35, EMS (Feb. 10, 2004).

159. For situational awareness in North Tower lobby, see FDNY interview 15, Chief (Jan. 14, 2004). For overall command post, see FDNY interview 52, Chief (Apr. 5, 2004).

160. For the collapse's effect on the firefighters, see FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 25, Battalion 1 (Jan. 23, 2004); FDNY interview 24, Battalion 6 (Jan. 23, 2004); FDNY interview 23, Chief (Jan. 23, 2004); FDNY interview 16, Battalion 1 (Jan. 20, 2004). For the reaction of firefighters not facing the south, see FDNY interview 7, Battalion 4 (Jan. 9, 2004); FDNY interview 10, Battalion 1 (Jan. 12, 2004); FDNY interview 12, Battalion 4 (Jan. 13, 2004); FDNY interview 26, Battalion 8 (Jan. 28, 2004); FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 16, Battalion 1 (Jan. 20, 2004).

161. It is possible that the repeater channel satellite on the roof of 5 WTC was damaged or destroyed when the South Tower collapsed.That the repeater channel stopped recording transmissions at 9:59 does not mean transmissions no longer could be made on it.

162. For the FDNY boat radioing of the collapse, see FDNY recording, FDNY Manhattan Dispatch Channel, Sept. 11, 2001. For the van being abandoned, see FDNY interview 42, Field Comm (Feb. 13, 2004). For the order one minute after the collapse, see FDNY interview 4, Chief (Jan. 8, 2004); Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001. For the subsequent order, see FDNY interview 40, Battalion 4 (Feb. 12, 2004).

163. For evacuation instructions, our analysis is based on more than 100 interviews we conducted and our review of 500 internal FDNY interview transcripts. For three firefighters hearing "imminent collapse," see FDNY interview, transcript 20, Battalion 10, Jan. 10, 2002; FDNY interview, transcript 23, Battalion 7, Jan. 21, 2002; FDNY interview, transcript 21, Battalion 8, Jan. 9, 2002.

164. For firefighters hearing orders over tactical 1, see, e.g., FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 29, Battalion 1 (Jan. 29, 2004). For one chief giving the instruction, see FDNY interview 23, Chief (Jan. 23, 2004).

165. For the chief on the 35th floor and the first instruction, see FDNY interview 23, Chief (Jan. 23, 2004). For the chief on the 23rd floor, see FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 16, Battalion 1 (Jan. 20, 2004). For the chief on the 35th floor hearing of the South Tower collapse and taking subsequent action, see FDNY interview 23, Chief (Jan. 23, 2004). For firefighters beginning to evacuate because of these chiefs, see, e.g., FDNY interview 16, Battalion 1 (Jan. 20, 2004); FDNY interview, transcript 9, Battalion 6, Dec. 5, 2001.

166. For radios not working in high-rise environments, see FDNY interview 9, Battalion 8 (Jan. 9, 2004); FDNY interview 13, Battalion 1 (Jan. 13, 2004). For tactical 1 being overburdened, see FDNY interview 16, Battalion 1 (Jan. 20, 2004). For the quotation, see FDNY interview, transcript 9, Battalion 6, Dec. 5, 2001.

167. For off-duty firefighters in the North Tower, see NYPD interview 6, ESU (Feb. 19, 2004); FDNY interview 24, Battalion 6 (Jan. 23, 2004). For firefighters dispatched to the South Tower, see FDNY interview 53, Battalion 11 (Apr. 14, 2004); FDNY interview, transcript 20, Battalion 10, Jan. 10, 2001.

168. For units stopping or delaying evacuation to help, see FDNY interview 40, Battalion 4 (Feb. 12, 2004); FDNY interview 59, Battalion 2 (Apr. 22, 2004); FDNY interview, transcript 3, Battalion 2, Oct. 9, 2001; FDNY interview, transcript 5, Battalion 6, Oct. 12, 2001. For companies first trying to regroup, see FDNY interview, transcript 3, Battalion 2, Oct. 9, 2001; FDNY interview, transcript 4, Battalion 4, Oct. 9, 2001. For the lack of urgency, see FDNY interview 57, SOC (Apr. 15, 2004); FDNY interview 25, Battalion 1 (Jan. 23, 2004); FDNY interview 16, Battalion 1(Jan. 20, 2004); FDNY interview, transcript 9, Battalion 6, Dec. 5, 2001; FDNY interview, transcript 4, Battalion 4, Oct. 9, 2001; FDNY interview, transcript 3, Battalion 2, Oct. 9, 2001. For the belief that urgency would have increased on learning of the South Tower's collapse, see FDNY interview, transcript 9, Battalion 6, Dec. 5, 2001; FDNY interview, transcript 5, Battalion 6, Oct. 12, 2001. For firefighters sitting and not evacuating, see FDNY interview 16, Battalion 1 (Jan. 20, 2004); NY State Court interview 1 (June 22, 2004). For firefighters not leaving while others remained and convincing others to stay with them, see FDNY interview, transcript 4, Battalion 4, Oct. 9, 2001; FDNY interview 57, SOC (Apr. 15, 2004).

169. FDNY interview 57, SOC (Apr. 15, 2004); FDNY interview 55, Battalion 8 (Apr. 15, 2004); FDNY interview, transcript 9, Battalion 6, Dec. 5, 2001; FDNY interview 59, Battalion 2 (Apr. 22, 2004); FDNY interview 10, Battalion 1 (Jan. 12, 2004); FDNY interview 7, Battalion 4 (Jan. 9, 2004); FDNY interview 13, Battalion 1 (Jan. 13, 2004); FDNY interview 23, Chief (Jan. 23, 2004); FDNY interview 26, Battalion 8 (Jan. 28, 2004); FDNY interview 12, Battalion 4 (Jan. 13, 2004).

170. FDNY interview 59, Battalion 2 (Apr. 22, 2004).

171. For hotel's damage, see Jules Naudet and Gedeon Naudet, video footage, Sept. 11, 2001. For individuals in the lobby, see FDNY interview 43, Chief (Mar. 3, 2004); FDNY interview 36, Chief (Feb. 10, 2004); FDNY interview 1, Chief (Mar. 26, 2004). On assisting the civilians, see FDNY interview 43, Chief (Mar. 3, 2004). For the line of 20 men and the 4 survivors, see FDNY interview, transcript 13, Battalion 11, Dec. 12, 2001.

172. For the two companies and their actions, see FDNY interview 22, Battalion 28 (Jan. 22, 2004); FDNY interview 37, Battalion 35 (Feb. 10, 2004); FDNY interview 39, Battalion 35 (Feb. 11, 2004); FDNY interview 41, Battalion 35 (Feb. 12, 2004); FDNY interview, transcript 12, Battalion 35, Dec. 12, 2001. For the PAPD having cleared the area, see PAPD statement 3,WTC command, Nov. 12, 2001. For FDNY personnel checking the area afterward, see FDNY interview, transcript 12, Battalion 35, Dec. 12, 2001.

173. For the senior leaders confirming the collapse, and the Chief of Department issuing a radio order, see FDNY interview 52, Chief (Apr. 5, 2004). For his ordering the post's relocation and two companies to respond, see FDNY interview 45, HQ (Mar. 8, 2004).

174. For the chiefs' delay in learning of the collapse, see FDNY interview 4, Chief (Jan. 8, 2004); FDNY interview 56, Chief (Apr. 23, 2004). On one chief 's view of the North Tower, see FDNY interview 51 (Apr. 2, 2004); FDNY interview 36, Chief (Feb. 10, 2004).

175. For firefighters' actions after the collapse, see FDNY interview 49, Chief (Mar. 17, 2004); FDNY interview 52, Chief (Apr. 5, 2004); FDNY interview 36, Chief (Feb. 10, 2004); FDNY interview 45, HQ (Mar. 8, 2004); FDNY interview 51 (Apr. 2, 2004); FDNY interview 22, Battalion 28 (Jan. 22, 2004); FDNY interview 1, Chief (Mar. 26, 2004); FDNY interview, transcript 1, Battalion 7, Jan. 28, 2001; FDNY interview, transcript 12, Battalion 35, Dec. 12, 2001. For some not knowing about the collapse but others knowing and remaining to help, see FDNY interview 49, Chief (Mar. 17, 2004); FDNY interview 52, Chief (Apr. 5, 2004); FDNY interview 36, Chief (Feb. 10, 2004); FDNY interview 45, HQ (Mar. 8, 2004). For the quotation, see FDNY interview 49, Chief (Mar. 17, 2004). For the firefighter directing those exiting, see FDNY interview 29, Battalion 1 (Jan. 29, 2004); FDNY interview 24, Battalion 6 (Jan. 23, 2004). For the using a bullhorn, see FDNY interview 52, Chief (Apr. 5, 2004). For the three senior members' actions, see FDNY interview 51 (Apr. 2, 2004).

176. NYPD recordings, City Wide 1 and Special Operations Division radio channels, Sept. 11, 2001; see also NYPD interview 12, Aviation (Mar. 10, 2004); NYPD interview 14, Aviation (Mar. 11, 2004); NYPD interview 13, Aviation (Mar. 10, 2004); NYPD interview 16,Aviation (Apr. 1, 2004).

177. NYPD recordings, City Wide 1, Special Operations Division, and Divisions 1, 2, and 3 radio channels, Sept. 11, 2001; NPYD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004).

178. For the ESU teams' situational awareness, see, e.g., NYPD interview 5, ESU (Feb. 19, 2004); NYPD interview 6, ESU (Feb. 19, 2004). For the evacuation order, see NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004).

179. For the message being clearly heard, see, e.g., NYPD interview 5, ESU (Feb. 19, 2004); NYPD interview 6, ESU (Feb. 19, 2004). For the subsequent exchange, see NYPD interview 6, ESU (Feb. 19, 2004); NYPD interview 5, ESU (Feb. 19, 2004); NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004).

180. For the ESU team's perspective, see NYPD interview 5, ESU (Feb. 19, 2004); NYPD interview 6, ESU (Feb. 19, 2004). For a firefighter stating he would not take instructions from the NYPD, see FDNY interview 38, Battalion 4 (Feb. 11, 2004). For a firefighter alleging that ESU officers passed him without sharing evacuation instruction, see FDNY interview 57, SOC (Apr. 15, 2004). A member of the only ESU team that this firefighter could have encountered above the 11th floor states that his team did share its evacuation instruction with firefighters it encountered. NYPD interview 6, ESU (Feb. 19, 2004).

181. NYPD interview 11, ESU (Mar. 9, 2004); NYPD interview 10, ESU (Mar. 1, 2004).

182. NYPD interview 7, ESU (Feb. 20, 2004); NYPD interview 15, ESU (Mar. 11, 2004); NYPD interview 18, ESU (Feb. 24, 2004).

183. NYPD interview 22, Intelligence (June 10, 2004); NYPD interview 23, Intelligence (June 10, 2004); NYPD interview 24, Intelligence (June 15, 2004).

184. NYPD interview 20, Manhattan South Task Force (May 4, 2004); NYPD interview 21, 6th Precinct (May 4, 2004); NYPD interview 4, Housing (Feb. 17, 2004); PAPD interview 4, Port Authority Bus Terminal Command (Nov. 20, 2003).

185. For officers being in the concourse, see NYPD recordings, City Wide 1, Special Operations Division, and Divisions 1, 2, and 3 radio channels, Sept. 11, 2001. For the survivors' actions, see NYPD memo, requests for departmental recognition 3, 4, 5 and 6, June 26, 2002; NYPD interview 19, 13th Precinct (May 4, 2004); NYPD interview 2,Transit (Jan. 2, 2004).

186. For the collapse's effect, see PAPD interview 3, LaGuardia Command (Nov. 20, 2003). For officers not receiving the evacuation order, see PAPD interview 7,WTC Command (Nov. 25, 2003); PAPD interview 5, Lincoln Tunnel Command (Nov. 24, 2003). For officers deciding to evacuate, see PAPD interview 10, GW Bridge Command (Sept. 25, 2003); PAPD statement 5, Lincoln Tunnel Command (Dec. 10, 2001). For officers slowing their descent, see PAPD interview 10, GW Bridge Command (Sept. 25, 2003).

187. For the North Tower collapsing at 10:28:25, see NIST report,"Progress Report on the Federal Building and Fire Safety Investigation of the WTC," June 18, 2004, appendix H, p. 40. For those in stairwell B who survived the North Tower's collapse, see FDNY report, Division 3 report on operations on Sept. 11, 2001, undated; Dennis Cauchon and Martha Moore,"Miracles Emerge from Debris," USA Today, Sept. 6, 2002, p.A1.

188. According to the number of death certificates issued by the New York City Medical Examiner's Office, the WTC attacks killed 2,749 nonterrorists, including nonterrorist occupants of the hijacked aircraft. New York City Office of the Chief Medical Examiner report,"WTC Victim List," undated (as of July 9, 2004).The Pentagon attack killed 184 nonterrorists, including the occupants of the hijacked aircraft. FBI report, list of Pentagon victims, undated (as of July 9, 2004). Forty nonterrorists died in the crash of United Airlines Flight 93 in Pennsylvania. FBI report, list of Flight 93 victims, undated (as of July 9, 2004). Our conclusion that these first responder death totals were the largest in U.S. history is based on our inability to find contrary evidence. For FDNY fatalities, see FDNY report, September 11 tribute, undated (online at www.ci.nyc.ny.us/html/fdny/media/tribute/tribute.html). For PAPD fatalities, see PAPD report, "In Memoriam," undated (online at www.panynj.gov/AboutthePortAuthority /PortAuthorityPolice/InMemoriam/). For NYPD fatalities, see NYPD report,"NYPD Memorial: 2001 Heroes," undated (online at www.ci.nyc.ny.us/html/nypd/html/memorial_01.html).

189. Rudolph Giuliani interview (Apr. 20, 2004); OEM interview 3 (Mar. 16, 2004); Richard Sheirer interview (Apr. 7, 2004);Thomas Von Essen interview (Apr. 7, 2004); Bernard Kerik interview (Apr. 6, 2004).

190.The Incident Command System (ICS) is a formalized management structure for command, control, and coordination during an emergency response. ICS provides a means to coordinate the efforts of individual agencies as they work toward the three main priorities of most emergencies-life safety, incident stability, and property/environment conservation.Within ICS, incident command is organized into five major components: the command function, the planning section, the operations section, the logistics section, and the finance/administra-tion section.When multiple agencies or jurisdictions are involved in a response, ICS provides for and can evolve into a unified command, with a decisionmaker from each key agency represented at the incident command level. For the system being used on 9/11, see, e.g., Arlington County,Virginia, report,Titan Systems Corp., "Arlington County: After-Action Report on the Response to the September 11 Terrorist Attack on the Pentagon," 2002, pp. 11, A-20-A-21.

191. Grant C. Peterson, "Introduction: Arlington County and the After-Action Report," July 28, 2003 (presented at conference in Arlington,Va.,"Local Response to Terrorism: Lessons Learned from the 9/11 Attack on the Pentagon").

192. For the death toll, see FBI report, list of Pentagon victims, undated. For patient care and victim disposition, see Arlington County,"After-Action Report," pp. B-1, B-12-B-15.

193. For reasons the response was mainly a success, see Arlington County, "After-Action Report," pp. 11-12; Edward Plaugher interview (Oct. 16, 2003). For preparations for the International Monetary Fund and the World Bank meetings, see "Washington Is Seeking Support to Handle Protests at 2 Meetings," New York Times, Aug. 18, 2001, p.A8;Arlington County,"After-Action Report," pp. 12, A-4, C-26.

194. For a list of the response agencies, see James Schwartz and Christopher Combs,"Incident Command, Joint Operations Center and Incident Communications," July 28, 2003 (presented at conference in Arlington,Va.,"Local Response to Terrorism: Lessons Learned from the 9/11 Attack on the Pentagon").When the Bureau of Alcohol, Tobacco, and Firearms moved from the Department of the Treasury to the Department of Justice after 9/11 in connection with the creation of DHS, it was renamed the Bureau of Alcohol,Tobacco, Firearms and Explosives (still abbreviated ATF); see ATF press release,"ATF Moves to the Department of Justice," Jan. 24, 2003.

195. For the establishment of incident command on September 11, see Arlington County, "After-Action Report," appendix 1, p. 1-1; Schwartz and Combs,"Incident Command."

196. Arlington County, "After-Action Report," appendix 1, p. 1-1. Other sources put the time of the partial collapse as late as 10:14. See Edward P. Plaugher,"Fire & EMS," July 28, 2003 (presented at conference in Arling-ton,Va.,"Local Response to Terrorism: Lessons Learned from the 9/11 Attack on the Pentagon").

197. Ibid., pp. A-30-A-31.

198. Edward A. Flynn,"Law Enforcement," July 28, 2003 (presented at conference in Arlington,Va., on "Local Response to Terrorism: Lessons Learned from the 9/11 Attack on the Pentagon").

199. Arlington County,"After-Action Report," pp. 12-13.

200. For the estimate, see NIST report, "WTC Investigation Progress," June 22-23, 2004. For the updated death certificate information, see New York City report, "WTC Victim List," June 21, 2004.The analysis in this paragraph is based upon the following sources: CNN, "September 11: A Memorial," updated 2004 (online at www.cnn.com/SPECIALS/2001/memorial/index.html); company contacts, June 29, 2004 (online at http://worldtradeaftermath.com/wta/contacts/companies_list.asp?letter=a); CNN, WTC tenants, 2001 (online at www.cnn.com/SPECIALS/2001/trade.center/tenants1.html); September 11 personal tributes, June 19, 2004 (online at www.legacy.com/LegacyTribute/Sept11.asp); September 11 personal profiles, Oct. 11, 2003 (online at www.september11victims.com/september11Victims); New York Times, Portraits: 9/11/01:The Collected "Portraits of Grief"  (Times Books, 2002). It is possible that a person who worked above the impact zone had not yet reached his or her office and was killed below the impact zone, either by falling debris, by the fireballs that exploded into the lobby, or by being trapped in an elevator. Individuals below the impact zone may have been killed for the same reasons. Individuals may also have been killed while in the process of evacuating.

201. Ironically, had the towers remained up longer, scores more first responders would have died.Twenty-six additional FDNY companies-more than 150 firefighters-were en route at the time of the South Tower's collapse, and scores more PAPD officers on Church and Vesey were preparing to enter the towers.

202.The "advisory" announcement directed by protocol (without the expanded instruction for occupants to return to their floors) would have given greater leeway to those who judged, based on a firsthand awareness of conditions on their floors (e.g., some could feel heat from North Tower explosion), that evacuation was warranted. In retrospect, occupants would only have had to reach a point below the 77th floor to be safe.

203.Appended to the directive was a list of different types of emergencies with designated Incident Comman-ders.Terrorist incidents were subdivided according to the types of attack. Conventional weapons and bomb threats were assigned to the NYPD, while chemical, biological, and nuclear attacks designated "NYPD or FDNY" as the Incident Commander.The directive noted:"The handling of a threat of a chemical or biological release or the use of conventional weapons falls to the NYPD. Dealing with the consequences of the explosion or release is the responsibility of the FDNY.The investigation that follows, once the consequences of the event have been mitigated, is the responsibility of the NYPD. Any conflicts regarding the issue of Command at these incidents will be resolved by OEM." New York City memo, Office of the Mayor, "Direction and Control of Emergencies in the City of New York," July 2001.

204. For the NYPD clearing lanes, see, e.g., FDNY interview 43, Chief (Mar. 3, 2004).

205. For the Mayor and Police Commissioner's consultation with the FDNY Chief of Department, see Rudolph Giuliani interview (Apr. 20, 2004).

206.The FDNY's lack of command and control had some unintended positive consequences. One battalion chief was dispatched to the South Tower but instead responded to the North Tower, where he was instrumental in saving many lives after the South Tower collapsed. Some FDNY units dispatched to the South Tower-where they would have perished-instead were mistakenly sent to the North Tower and in many cases survived.

207. For the FDNY addressing these issues, see generally FDNY report, McKinsey & Company, "FDNY Report," Aug. 19, 2002; Peter Hayden interview (Jan. 14, 2004). For the PAPD not changing standard operating procedures or training, see PAPD regulations,"Manual of Police Division Instructions," undated (in existence before and after 9/11); Barry Pickard interview (Nov. 24, 2003).

208. One instance in which the FDNY/NYPD rivalry may have had an impact on the total fatalities was the alleged failure of ESU officers descending past at least two firefighters after 9:59 in the North Tower to share their evacuation instructions. It should be noted, however, that at least one firefighter has conceded that he, too, descended past other stationary firefighters without telling them to evacuate. In addition, according to one of the ESU officers and one of the firefighters in the North Tower, at least some FDNY personnel were unwilling to take evacuation orders from police that morning.

209. Based on more than 100 interviews we conducted and our review of 500 internal FDNY interview transcripts, we conclude that out of these 32 companies, all on-duty members of 19 companies are likely to have known to evacuate (Engine Companies 1, 4, 7, 9, 15, 16, 21, 24, 28, 33, 39, and 65; Ladder Companies 1, 5, 6, 8, 9, 110; and Rescue 1).We also conclude that at least some members of each of five companies knew to evacuate (two firefighters from Ladder Company 10; the officer of Ladder Company 20; all but the officer of Engine Company 10; at least two firefighters from Squad 18; and at least three firefighters from Engine 6).We do not know whether members of the eight other companies knew to evacuate (Engine Companies 55, 207, and 226; Rescue 2, 3, and 4; Hazmat 1; and Squad 1) because they all died, and we have come across no on-point eyewitness accounts related to their operations. It is very possible that at least some of these firefighters did hear the evacuation order but nevertheless failed to evacuate in the only 29-minute period between the collapse of the two towers. In addition, it is possible that several of the eight companies for which we have no record of their receiving evacuation instructions were in the South Tower and thus died in its earlier collapse.

210. Eric Lipton,"A New Weapon for Firefighters," New York Times, May 30, 2004, p. 27.