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 man in uniform stands at the reflecting pools at the 9/11 Memorial. Photo by John Angelillo/UPI

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The victims names were read aloud in the ceremony at the 9/11 Memorial. Photo by John Angelillo/UPI

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A man and woman embrace while the victims names are read aloud. Photo by John Angelillo/UPI

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Mourners arrive for the ceremony at the reflecting pools. Photo by John Angelillo/UPI

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