Arapahoe High School shooting

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A suburban Denver student shot at least one other student at Arapahoe High School on Friday before he apparently turned the gun on himself, authorities said. The 18-year-old shooter -- identified by authorities as Karl Pierson -- critically wounded a 15-year-old student, but the strategic response by police on the eve of the Newtown massacre anniversary appears to have averted more bloodshed.

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