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20th anniversary of 9/11 attacks marked with ceremonies(35 images)

The 20th anniversary of the September 11, 2001, terror attacks was marked with ceremonies at the attack sites in New York City, Washington, D.C., and Shanksville, Pa., on Saturday.

A bell is rung for a moment of silence during the annual 9/11 commemoration ceremony at the 9/11 Memorial on Saturday. Pool Photo by Chip Somodevilla/UPI | License Photo
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