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10 Years Later, Looking Back At Columbine

On April 20, 1999, the nation was shocked when two students went on a killing rampage at Columbine High School in Littleton, Colo., that left 12 students and one teacher dead. A decade later, the images of that day and aftermath continue to haunt teens and parents across the country.

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Seven week before the massacre at Columbine High School, Eric Harris, left, watches as Dylan Klebold practices shooting a gun at a makeshift shooting range on March 6, 1999, in Douglas County, Colo.

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