World Trade Center site
On the morning of September 11, 2001, Islamic terrorists affiliated with Al-Qaeda hijacked American Airlines Flight 11 and United Airlines Flight 175, both which were en route to Los Angeles, and intentionally crashed them into the two main towers of the World Trade Center. The towers collapsed within two hours of the collisions. 2,606 people, including 2,192 civilians, 71 law enforcement officers, and 343 firefighters, who were in the towers and in the surrounding area died in the attacks, as well as 147 civilians and the 10 hijackers aboard the two airliners. After the collapse of the World Trade Center, hospital workers and law enforcement officers began referring to the World Trade Center site as "Ground Zero".
American Airlines Flight 11
Rescue workers at the World Trade Center site began to discover body fragments from Flight 11 victims within days of the attack. Some workers found bodies strapped to airplane seats and discovered the body of a flight attendant with her hands bound, suggesting the hijackers might have used plastic handcuffs. Within a year, medical examiners had identified the remains of 33 victims who had been on board Flight 11. They identified two other Flight 11 victims, including purser Karen Martin, in 2006, while other unrelated body fragments were discovered near Ground Zero around the same time. In April 2007, examiners using newer DNA technology identified another Flight 11 victim. The remains of two hijackers, potentially from Flight 11, were also identified and removed from Memorial Park in Manhattan. The remains of the other hijackers have not been identified and are buried with other unidentified remains at this park.