9/11 Anniversary: Remembering September 11 Attacks -- ABC News - ABC News

Subdued Ceremonies Mark 11th Anniversary

Justin Lane/AP Photo

Subdued Ceremonies Mark 11th Anniversary

Pres. Obama says 9/11 taught U.S. a 'lesson"

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Smoke rises over lower Manhattan after the collapse of the World Trade Center, Sept. 11, 2011, in New York.

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President Barack Obama and Vice President Joe Biden, along with members of the national security team, receive an update on the mission against Osama bin Laden in the Situation Room of the White House, in Washington, in this May 1, 2011 photo.

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