15th anniversary of tragic Columbine High School shooting; Here’s the background:

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Today marks the 15th anniversary of a tragic mass shooting in Colorado.

12 students and a teacher were killed in a mass shooting at Columbine High School.

Here is some background information about the deaths of 13 people at Columbine High School in Littleton, Colorado on April 20, 1999.

Twelve students and one teacher were killed by students Dylan Klebold, 17, and Eric Harris, 18.

The pair made home videos prior to the attack making references to what they were going to do and apologizing to their parents for it.

Harris and Klebold killed themselves with gunshot wounds to the head in the school’s library at approximately 12:08 PM on the day of the shootings.

SWAT teams entered the school 47 minutes after the shootings started. Five hours passed before law enforcement declared the school under control.

The Columbine shootings rank as one of the worst mass shootings in U.S. history as well as one of the deadliest episodes of school violence.

Cassie Bernall, 17

Steven Curnow, 14

Corey Depooter, 17

Kelly Fleming, 16

Matthew Kechter, 16

Daniel Mauser, 15

Daniel Rohrbough, 15

Rachel Scott, 17

Isaiah Shoels, 18

John Tomlin, 16

Lauren Townsend, 18

Kyle Valasquez, 16

William “Dave” Sanders, 47

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