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Fifteen mass shootings at U.S. schools since 1999’s massacre at Columbine High School in.

United statesUmpqua community collegeMarysville pilchuck high schoolSandy hook elementary schoolRed lake high schoolColumbine schoolNorthern illinois universityOxford schoolIsla vistaEast oaklandMarjory stoneman douglas high schoolWashington stateColumbine high schoolOlumbine uvaldeOxford high schoolMarysville pilchuck high school