Nearly 3,000 people died in the attacks carried out by 19 terrorists from al-Qaeda who hijacked four commercial airplanes and crashed them into the Twin Towers at the World Trade Center in New York City and a third plane into the Pentagon in Arlington, Virginia.
On September 11, 2001, militants associated with the Islamic extremist group al Qaeda hijacked four airplanes and carried out suicide attacks against targets in the United States.
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