Tenth anniversary of Sept. 11 attacks

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

Vasantha Velamuri, who's husband, Sankara Sastry Velamuri, was killed in the 9/11 terrorist attacks on the World Trade Center, mourns at the place where his name is inscribed on the Sept. 11 memorial at the World Trade Center site in New York during a ceremony to mark the 10th anniversary of the attacks Sunday, Sept. 11, 2011. (AP Photo/Carolyn Cole, Pool)

Vasantha Velamuri, who's husband, Sankara Sastry Velamuri, was killed in the 9/11 terrorist attacks on the World Trade Center, mourns at the place where his name is inscribed on the Sept. 11 memorial at the World Trade Center site in New York during a ceremony to mark the 10th anniversary of the attacks Sunday, Sept. 11, 2011. (AP Photo/Carolyn Cole, Pool)

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