RetroNewsNow on Twitter "On April 20, 1999, two teenage gunmen killed(00)

RetroNewsNow on Twitter "On April 20, 1999, two teenage gunmen killed(00)

Image Gallery: How Columbine Shooting Crime Scene Pictures Became The Internet’s Hottest Topic

RetroNewsNow on Twitter "On April 20, 1999, two teenage gunmen killed Archival photos show the day of the Columbine shooting and aftermath Columbine High School shooting 13 dead, dozens hurt in 1999 massacre The Columbine High School Massacre Crime Scene Cleanup The AR15’s destructive force A rare look at the weapon’s impact