This April 28, 1999, file photo shows a cross bearing the name and likeness of Dylan Klebold and a message "How can anyone forgive you?" on a hill in Littleton, Colo., near Columbine High School where someone erected crosses to honor the dead. Klebold, along with schoolmate Eric Harris, killed 13 people before taking their own lives on April 20, 1999. (Eric Strachan/Denver Rocky Mountain News via AP, File)
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