Photos: A Nation Remembers Sept. 11

A Nation Remembers 9/11
Charles Dharapak / AP

Washington, Sept. 11, 2011
President Barack Obama and First Lady Michelle Obama lay a wreath as the 10th anniversary of the 9/11 attacks is observed at the Pentagon in Washington on Sunday, Sept. 11, 2011. At right is Chairman of the Joint Chiefs of Staff Mike Mullen.

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