Unidentified 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, Saturday April 24, 1999. Twelve students and a 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)

From the Editor: Columbine memories bind us together 20 years later, as do the issues that grew out of tragedy

Larry Ryckman was assistant managing editor at The Associated Press when the Columbine High School massacre happened in 1999. He directed news coverage of the tragedy and its aftermath "for many long days and nights."

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