Tributes to 9/11 victims across the U.S.

Associated Press
President Barack Obama, flanked by Defense Defense Leon Panetta, left, and Joint Chiefs Chairman Gen. Martin Dempsey, place their hands over their hearts at the Pentagon Memorial,Tuesday, Sept. 11, 2012, during a ceremony to mark the 11th anniversary of the Sept. 11 attacks. (AP Photo/Carolyn Kaster)

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Tributes were held around the country for the 10th anniversary of the Sept. 11 terrorist attacks on the U.S.

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