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FILE - In this Tuesday, April 20, 1999 file photo, four unidentified young women head to a library near Columbine High School where students and faculty members were evacuated after two student gunmen went on a shooting rampage in the school in the Denver suburb of Littleton, Colo. The attack left 12 students and one teacher dead. These horrifying images of tearful students would be repeated in other mass shootings at schools in later years. (AP Photo/Kevin Higley)