The attack on the World Trade Center's twin towers occurred on Sept. 11, 2001. The attack was carried out by 19 members of the terrorist group al-Qaeda and involved the hijacking of four airline planes. Two of the planes were then deliberately crashed into the towers in a suicide attack.
American Airlines Boeing 767 hit the north tower at 8:45 a.m. near the 80th floor. United Airlines Flight 175, another Boeing 767, hit the south tower 18 minutes later near the 60th floor. Due to the excessive heat of the fire generated by the jet fuel, the south tower's structural integrity was compromised and it collapsed just before 10 a.m. The north tower followed, collapsing at 10:30 a.m.
A total of 3,000 people died during New York City attack, including all the passengers on the planes. Among the rescue personnel who died were 343 firemen and paramedics. Additionally, 37 Port Authority police officers and 23 New York City police officers perished.
During the attack on New York City, American Airlines Flight 77, a Boeing 757, headed towards Washington, D.C. and crashed into the west walls of the Pentagon killing 124 people. All 64 passengers on the plane died.
A fourth hijacked plane, United Flight 93, crashed in western Pennsylvania after its passengers attempted to retake control from the hijackers. All 45 of the passengers died in the crash