The September 11, 2001, terrorist attacks were carried out by 19 militants associated with the extremist group al-Qaeda, which was led by Osama bin Laden at the time. The attackers hijacked four commercial airplanes, crashing two into the Twin Towers of the World Trade Center in New York City and another into the Pentagon in Arlington, Virginia. The fourth plane, United Airlines Flight 93, crashed into a field in Pennsylvania after passengers


