Thousands of people gather to mark the 11th anniversary of the al-Qaida terrorist attacks that killed nearly 3,000 people in the United States.
US Marks Anniversary of September 11 Attacks
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The World Trade Center Flag is presented as friends and relatives of the victims of the September 11, 2001, terrorist attacks, the National September 11 Memorial at the World Trade Center site in New York, September 11, 2012.
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President Barack Obama, first lady Michelle Obama, and members of the White House staff pause during a moment of silence to mark the 11th anniversary of the September 11 attacks on the South Lawn of the White House in Washington.
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A woman becomes emotional after reading the name of her father as friends and relatives of the victims of the September 11 attacks gather at a memorial, New York, September 11, 2012.
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Friends and relatives of the victims of the September 11 terrorist attacks attend a ceremony marking the 11th anniversary of the attacks, New York, September 11, 2012.