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Two students and one teacher killed, one other wounded when 14-year-old Barry Loukaitis opened fire on his algebra class.
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16 children and one teacher killed at Dunblane Primary School by Thomas Hamilton, who then killed himself. 10 others wounded in attack.
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Principal and one student killed, two others wounded by Evan Ramsey, 16.
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Two students wounded. Colt Todd, 14, was hiding in the woods when he shot the students as they stood in the parking lot.
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Chris Buschbacher, 17, took two hostages at the Caro Learning Center before killing himself.
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A nursing student shot and killed two women and then herself in a classroom at Louisiana Technical College in Baton Rouge.
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Two people opened fire during a Worthing High School powder-puff football game. One former student died. Five other people were injured.
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A 14-year-old student shot himself in front of 70 fellow students.
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At Chardon High School, a former classmate opened fire, killing three students and injuring six. Arrested shortly after the incident, the shooter said that he randomly picked students.