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Students from Arapahoe High Scool gather outside the school after being evacuated in Centennial, Colorado, on December 13.
Students from Arapahoe High Scool gather outside the school after being evacuated in Centennial, Colorado, on December 13.

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    Sheriff: School shooter sought revenge

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Sheriff: School shooter sought revenge

Police say the Colorado school shooter may have sought revenge against a teacher.

Sheriff: School shooter sought revenge

Police say the Colorado school shooter may have sought revenge against a teacher.