Police: School gunman bought weapon legally

The teen gunman who shot himself dead after critically wounding a fellow student at their suburban Denver high school legally purchased the shotgun and ammunition he used in Friday's rampage at Arapahoe High School, according to Sheriff Grayson Robinson.

A vigil being held in Arapahoe for 18-year-old Claire Davis, who was critically injured in the school shooting.

The attack by Karl Pierson, 18, lasted less than a minute and a half, the sheriff said.

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Girl critical after Colorado high school 'revenge' shooting

A 17-year-old female student is in a critical condition in hospital after being injured in a shooting at a high school in the US state of Colorado. The suspected gunman was found dead at the scene with an apparently self-inflicted gunshot wound.