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September 11 Anniversary: 50 Pictures We’ll Never Forget

A student bows his head at a prayer service in the basketball arenas at Brigham Young University in Provo, Utah in behalf of the victims of the terrorist attacks. More than 15,000 people attended the service. (GEORGE FREY/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.