On Sept. 11, 2001, four U.S. airliners were highjacked in a coordinated attack by the terrorist organization al-Qaeda against the United States, crashing into the Twin Towers of the World Trade Center in New York, the Pentagon in Washington D.C. and an area outside of Shanksville, Penn. As a result, 2,977 people were killed and our nation was brought into war. Take a look back at harrowing photos from that day, and the days after, in what has been called the worst terrorist attack in American history.

Originally Published: September 10, 2024 at 3:00 PM EDT

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