Tenth anniversary of Sept. 11 attacks

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

New York City police and firefighters, and Port Authority of NY & NJ police officers salute during the singing of the "Star Spangled Banner" at the Sept. 11 memorial, during 10th anniversary ceremonies at the site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Chip Somodevilla, Pool)

New York City police and firefighters, and Port Authority of NY & NJ police officers salute during the singing of the "Star Spangled Banner" at the Sept. 11 memorial, during 10th anniversary ceremonies at the site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Chip Somodevilla, Pool)

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