Tenth anniversary of Sept. 11 attacks

President Obama and former President George W. Bush lead a remembrance ceremony of the fateful day in 2001.

Visitors hug near a memorial pool at the National September 11 Memorial at the World Trade Center site  in New York, Sunday, Sept. 11, 2011. (AP Photo/Seth Wenig, Pool)

Visitors hug near a memorial pool at the National September 11 Memorial at the World Trade Center site in New York, Sunday, Sept. 11, 2011. (AP Photo/Seth Wenig, Pool)

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