Ceremonies mark 17th anniversary of 9/11 attacks(42 images)

Ceremonies mark the 17th anniversary of the terrorist attacks on September 11, 2001, in which four airliners were hijacked. Two crashed into the World Trade Center in New York City, another hit the Pentagon in Washington, D.C. A fourth, headed for D.C., crashed in Shanksville, Pa. Nearly 3,000 people were killed.

A boy with the name of a 9/11 victim on the back of his shirt arranges a flower at the reflecting pools at the 9/11 Memorial near One World Trade Center at Ground Zero in New York City. Robert Houghes, the victim on the boy's shirt, was 23 years old. Houghes, a margins clerk at Bank of America, assisted an elderly woman down the stairs from the 83rd floor when the plane hit the tower. He was last seen by co-workers on the bottom floor of the towers before debris started coming down. Photo by John Angelillo/UPI | License Photo
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