World Trade Center (1973–2001)
In the immediate aftermath of the attacks, media reports suggested that tens of thousands might have been killed in the attacks, as over 50,000 people could be inside the World Trade Center, although the National Institute of Standards and Technology (NIST) estimated that approximately 17,400 occupants were in the towers at the time of the attacks. Ultimately, 2,753 death certificates (excluding those for hijackers) were filed relating to the 9/11 attacks in New York City, including one filed for Felicia Dunn-Jones, who was added to the official death toll in ; Dunn-Jones died five months later from a lung condition linked to exposure to dust during the collapse of the World Trade Center. Three other victims were then added to the official death toll by the city medical examiner's office: Dr. Sneha Anne Philip, who was last seen the day before the attacks; Leon Heyward, a man who developed lymphoma and subsequently died in 2008 as a result of dust ingestion during the events following the attacks to the Twin Towers; and Jerry Borg, who died in December 2010 of pulmonary sarcoidosis determined in June 2011 to be the result of dust from the attacks. 2,192 civilians died in and around the World Trade Center, including 658 employees of Cantor Fitzgerald L.P. (an investment bank on the 101st–105th floors of One World Trade Center), 295 employees of Marsh & McLennan Companies (which was located immediately below Cantor Fitzgerald on floors 93–101, the location of Flight 11's impact), and 175 employees of Aon Corporation. In addition to the civilian deaths, 343 New York City Fire Department (FDNY) firefighters were killed in the attacks, as well as 71 law enforcement officers, including 37 members of the Port Authority Police Department (PAPD) and 23 members of the New York City Police Department (NYPD). Ten years after the attacks, remains of only 1,629 victims had been identified. Of all the people who were still in the towers when they collapsed, only 20 were pulled out alive.
Marriott World Trade Center
When American Airlines Flight 11 crashed into the North Tower (1 WTC) at 8:46 AM EDT, its landing gear fell on the hotel's roof. Firefighters used the lobby as a staging area, and were also in the hotel to evacuate guests that may have still been inside. Firefighters also reported human remains of entire corpses on the roof from people that had jumped or accidentally fallen from the burning towers. The collapse of the South Tower (2 WTC) at 9:59 AM EDT split the building in half (such damage can briefly be seen in the documentary film "9/11"), and the collapse of the North Tower at 10:28 AM EDT destroyed the rest of the hotel aside from a small section (as seen on the picture) that was furthest from the North Tower. Fourteen people who had been trying to evacuate the partially destroyed hotel after the first collapse managed to survive the second collapse in this small section. The section of the hotel that had managed to survive the collapse of the Twin Towers had been upgraded after the 1993 bombing.