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Photos

People in front of New York's St. Patrick's Cathedral react with horror as they look down Fifth Ave towards the World Trade Center towers after planes crashed into their upper floors.
Marty Lederhandler / AP

Remembering 9/11

20 years ago: Looking back at 9/11 in pictures

Nearly 3,000 people lost their lives on Sept. 11, 2001, in coordinated attacks on the World Trade Center and Pentagon and a crash in Shanksville, Pennsylvania.