(NBC NEWS) A gunman opened fire at a high school in Colorado on Friday, injuring two classmates before killing himself, authorities said.

The shooter, who said he was looking for a pecific teacher by name, was identified only as a student at Arapahoe High School in Centennial, Arapahoe County Sheriff Grayson Robinson said.

A second student was shot and seriously wounded, while the third student was being treated for a minor injury that might not have been a gunshot wound, he said.

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