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Pontac's Rebellion school massacre
3 intruders. Schoolmaster and 10 kids got killed. only one survived. -
Altona schoolehouse shooting
4 people killed. A teacher confronted some of his student - whom he had had some problems with - by shooting them with a revolver. He then went back to the school house and shot some girls, before he turned the gun on himself. -
École Polytechnique massacre
15 died. -
Columbine highschool shooting
Two student went to their highschool and killed 15, and injured 24. They then killed themselves. -
Virginia tech massacre
32 killed.