The 9- 11 attacks were a series of four coordinated suicide
attacks upon the United States in New York City and the Washington,
D.C., area on September 11, 2001.
On that Tuesday morning, 19 terrorists highjacked four passenger
jets. The hijackers intentionally crashed two planes, American
Airlines Flight 11 and United Airlines Flight 175, into the Twin
Towers of the World Trade Center in New York City; both towers
collapsed within two hours.
Hijackers crashed American Airlines Flight 77 into the Pentagon
in Arlington, Virginia.
The fourth jet, United Airlines Flight 93, crashed into a field
near Shanksville, Pennsylvania, after passengers attempted to take
control before it could reach the hijacker's intended target in
Washington, D.C.
Nearly 3,000 died in the attacks.