FILE - In this April 24, 1999, file photo, students embrace each other at a makeshift memorial for their slain classmates at Columbine High School on a hilltop overlooking the school in Littleton, Colo. Twelve students and one teacher were killed in a murderous rampage at the school on April 20, 1999, by two students who killed themselves in the aftermath. (AP Photo/Bebeto Matthews, File)
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