Police in Arapahoe County, Colorado, says the shooting incident at Arapahoe High School is over. ABC News reports Arapahoe County Sheriff Grayson Robinson says the shooter arrived armed at the school around noon, asking for a specific teacher. He was confronted by another student in the hall, who was then shot. Sheriff Grayson says the shooter is dead as a result of a self-inflicted gunshot wound and there are no other threats at this time. One student has been injured and another is in critical condition.