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September 11 Anniversary: 50 Pictures We’ll Never Forget

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President Bush walks off the steps of Air Force One at Offutt Air Force Base near Omaha, Nebraska, to have a National Security briefing about the two planes that crashed into the World Trade Center. (DOUG MILLS/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.