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September 11 Anniversary: 50 Pictures We’ll Never Forget

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An American flag flies in the foreground as one of the World Trade Center towers burns in the background. (DOUG KANTER/AFP/Getty Images)

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Today marks the 13th anniversary of the September 11, 2001, tragedy, when terrorist attacks by al-Qaeda killed nearly 3,000 people in New York City and Washington, D.C. Remember those who died on this day that changed everything.