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September 11 Anniversary: 50 Pictures We’ll Never Forget

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A wall of dust and smoke races through streets framed by St. Paul's Chapel (L) and the Astor Building (R) as the top of one of World Trade Center towers collapses. (STAN HONDA/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.