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Another student was found with a minor gunshot wound.
The Sheriff says that one student confronted the shooter, and was shot. That student is now in critical condition.
The Sheriff says that the shooter is dead, and that he apparently killed himself.
Grayson Robinson, the Arapahoe Country Sheriff, has said that the shooter came to the school with a shotgun, saying that he was after a teacher.
Shooting At Colorado High School - Breaking[/caption]Hospital personnel were told to prepare for a "mass injury incident" after two people were reported injured in a shooting Friday at a high school in Colorado.
A nursing supervisor at the Medical Center of Aurora told NBC News that the hospital was on standby for ambulances coming Arapahoe High School in Centennial.
NBC station KUSA of Denver reported that two people were injured in what police described as an "active shooter situation." No one was in custody, the station reported.
The school is part of the Littleton public school systems, based in Arapahoe County — the same county where James Eagan Holmes is accused of having killed 12 people in a movie theater in the town of Aurora.
The high school is 13km east of Columbine High School in Littleton, Colorado, which was the site of a mass school shooting in 1999 which left 14 students dead.
This is a breaking news story. Check back for more.