Classes canceled at Columbine on 16th shooting anniversary

April 20, 2015
Photo: Columbine High School (AP Photo)
Students arrive for classes at Columbine High School in Littleton, Colo. in a file photo.

A moment of silence to honor those lost on April 20, 1999 will be held at 11:20 a.m. in the school's library, which was rebuilt following the attack.

The tradition of canceling classes on the shooting's anniversary started under the principal at the time, Frank DeAngelis. He retired last year and the school's new leader, K.C. Somers, sent a letter to students earlier this month saying the tradition would continue for the foreseeable future.