Breaking from NBC news:
A gunman opened fire at a high school in Colorado on Friday, seriously wounding a fellow student before killing himself, authorities said.
A third student was injured and was reported in good condition. It wasn't immediately clear whether that student was shot.
The shooter, a male student, said he was looking for a specific teacher by name when the incident began about 12:30 p.m. (2:30 p.m. ET) at Arapahoe High School in Centennial, Arapahoe County Sheriff Grayson Robinson said. Robinson said investigators knew his identity and were talking to his family.
A second student confronted the gunman, who shot and seriously wounded the youth, Robinson said.