A high school student on an Indian reservation in northern Minnesota went on a shooting rampage Monday, killing nine people including five students, before turning the gun on himself in the worst U.S. school shooting since Columbine.

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A 19-year-old expelled high school student killed 17 people and himself in a shooting rampage at a German high school Friday.

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In what police have called an apparent "suicide mission," two students opened fire on classmates and faculty Tuesday at a suburban Denver high school, killing 15 and sending 23 to the hospital.

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