Map of school shootings since Columbine

This map displays all of the school shootings that have happened since the Columbine shooting that took place on April 20, 1999 in Littleton, Colo. There have been 129 so far.

Key

  • Red- mass school shootings where more than four people killed
  • Purple- school shootings where 1-3 people were killed
  • Blue- school shootings where multiple people were injured, but none were killed

The shootings included are those that follow TIME’s criteria for school shootings.

TIME’s criteria for school shootings:

  • “At least one victim was injured or killed
  • Either the shooter or at least one of the victims was a student or teacher
  • The attack occurred on school property, including the parking lot, though not necessarily during school hours.
  • Injuries are counted only if they resulted from gunfire, not the ensuing chaos.”