Shooting may be 'revenge attack' after teacher conflict

The suspected shooter at Arapahoe High School may have been a student seeking revenge over a conflict with a teacher, Arapahoe County Sheriff Grayson Robinson said.

Sheriff Robinson said the identity of the gunman will not be released "until everything is confirmed".

Read: Female student critical after school shooting

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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.