September 11 attacks, also called 9/11 attacks, series of airline hijackings and suicide attacks committed in 2001 by 19 militants associated with the Islamic extremist group al-Qaeda against targets in the United States, the deadliest terrorist attacks on American soil in U.S. history.
Britannica: September 11 Attacks
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Resource Link: https://www.britannica.com/event/September-11-attacks