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On April 20, 1999, two armed students opened fire on faculty and classmates at Columbine High School in the Denver suburb of Littleton. Thirteen people – 12 students and one teacher – were killed during the massacre.
At about 11:20 a.m., principal Frank DeAngelis was alerted to students with bombs by his secretary. He ran into the hallway thinking that it was a senior prank. The horror struck immediately as bullets flew and glass broke. His worst nightmare. Since that day, there have been .
Read more: The Denver Post reports on the 20th anniversary of the shooting that left 13 dead on April 20, 1999