3 School Shootings That Pre-Date Columbine

The Columbine High School shooting in April 1999 has inspired dozens of school shootings around the world. There is even a term called the "Columbine Effect." While it was the most influential school shooting in history, it was far from the first.

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[0:14] The Cleveland Elementary School Shooting
[8:17] The Montreal Massacre
[18:58] The Dunblane School Shooting