** FILE ** Eric Harris (left) and Dylan Klebold, carrying a TEC-9 semi-automatic pistol, are seen in a photo made from a security camera image in the cafeteria at Columbine High School in Littleton, Colo., during their shooting rampage on April 20, 1999. (AP Photo/Jefferson County Sheriff's Department)

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** FILE ** Eric Harris (left) and Dylan Klebold, carrying a TEC-9 semi-automatic pistol, are seen in a photo made from a security camera image in the cafeteria at Columbine High School in Littleton, Colo., during their shooting rampage on April 20, 1999. (AP Photo/Jefferson County Sheriff's Department)