Mass School Shootings: A History

ABC News

As the numbers of the dead from a Newtown, Conn., elementary school shooting climbed into the double digits, it’s hard not to remember that we have been here before.

The Sandy Hook elementary school shooting is the deadliest at a high school or grade school in the history of the country, but it is far from the first. Several mass school shootings have speckled our recent history.

Thirteen years ago, the small community of Littleton, Colo., was rocked by a massacre at Columbine High School. Gunmen Eric Harris, 18, and Dylan Klebold, 17, walked into their school on April 20, 1999, and opened fire, killing 12 of their classmates and a teacher, and injuring 21 more, before turning their firearms on themselves.

At the time, it was dubbed the most deadly school shooting in American history, and it changed the way many communities across the country thought about school safety.