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An American flag is unfurled during a commemoration to mark the 10th anniversary of the Sept. 11 attacks on the United States, at the Trocadero plaza , near the Eiffel tower, seen in the background, in Paris, Sunday, Sept. 11, 2011. (AP Photo/Thibault Camus)

International 9/11 Memorials

People around the world honor the victims of the September 11 attacks.