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When a gunman killed 20 first graders and six adults with an assault rifle at Sandy Hook Elementary School in 2012, it rattled Newtown, Conn., and reverberated across the world. Since then, there have been at least 239 school shootings nationwide. In those episodes, 438 people were shot, 138 of whom were killed.

The data used here is from the Gun Violence Archive, a nonprofit that began tracking school shootings in 2014, about a year after Sandy Hook.

Gunshot Victims in School Shootings

The shootings have taken place at sporting events and in parking lots, cafeterias, hallways and classrooms.

A shooting took place Wednesday at Marjory Stoneman Douglas High School in Parkland, Fla., about an hour northwest of Miami. As of Wednesday night, 17 people had been killed and the number of people injured was unknown.

Sixteen of the 239 shootings shown below can be classified as mass shootings, events in which four or more people are shot.

On average, there have been about five school shootings each month, including episodes that were not mass shootings.