It’s been 20 years since the September 11 attacks.
Two of the planes were intentionally crashed into the World Trade Center towers in New York. Another crashed into the Pentagon. The fourth crashed in a field near Shanksville, Pennsylvania. Nearly 3,000 people were killed.
Here’s a look back at the day in photos.
(📸: Spencer Platt/Getty Images, Jose Jimenez/Primera Hora/Getty Images, Marty Lederhandler/AP, Paul J. Richards/AFP/Getty Images, Henny Ray Abrams/AFP/Getty Images, Alex Wong/Getty Images, Mario Tama/Getty Images, David Maxwell/AFP/Getty Images, Eric Draper/The White House/Getty Images, Universal History Archive/Universal Images Group via Getty Images, Boudicon One/AP)