11 : Another Battle Official

On the morning of Tuesday, September 11, 2001, 19 militants associated with the Islamic extremist group hijacked four commercial airplanes.

: The fourth plane crashed in a field near Shanksville, Pennsylvania, after passengers and crew fought back against the hijackers, preventing it from reaching its intended target in Washington, D.C.. Immediate and Long-Term Impact Remembering September 11 | National Geographic Kids 11 : Another Battle

: Two planes were flown into the Twin Towers in New York City, eventually causing both buildings to collapse. On the morning of Tuesday, September 11, 2001,