Karl Gehring/The Denver Post
Colorado School Shooting
Students comfort each other at Arapahoe High School in Centennial, Colo., Dec. 13, 2013. Arapahoe County Sheriff Grayson Robinson said a student shot two others at the school before apparently killing himself.Karl Gehring/The Denver PostColorado School Shooting
A woman screams as she arrives at a church where students from nearby Arapahoe High School were evacuated to after a shooting on the Centennial, Colo., campus, Dec. 13, 2013.Brennan Linsley/AP PhotoColorado School Shooting
Sheriff's deputies are at Arapahoe High School in Centennial, Colo., Dec. 13, 2013, where a student shot at least one other student before he apparently killed himself, authorities said.R.J. Sangosti/The Denver Post via Getty ImagesColorado School Shooting
Parents waited to be reunited with their children outside Arapahoe High School, in Centennial, Colo., Dec. 13, 2013.Karl Gehring/The Denver PostColorado School Shooting
Students comfort each other at Arapahoe High School in Centennial, Colo., Dec. 13, 2013, where a student shot at least one other student before he apparently killed himself, authorities said.R.J. Sangosti/The Denver Post via Getty ImagesColorado School Shooting
Sheriff's deputies are at Arapahoe High School in Centennial, Colo., Dec. 13, 2013, where a student shot at least one other student before he apparently killed himself, authorities said.R.J. Sangosti/The Denver Post via Getty ImagesColorado School Shooting
People gather outdoors as police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.Ryan Parker/Denver PostColorado School Shooting
Parents wait for word about their children outside of Arapahoe High School after a shooter was reported on campus in Centennial, Colo., Dec. 13, 2013.John Leyba/The Denver PostColorado School Shooting
Police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.KDVR/AP PhotoColorado School Shooting
Police search students gathered outside of Arapahoe High School as authorities respond to reports of a shooting at the school in Centennial, Colo. Dec. 13, 2013.KDVR/AP PhotoColorado School Shooting
People gather outdoors as police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.Ryan Parker/Denver PostColorado School Shooting
Students gather outdoors as police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.Ryan Parker/Denver PostColorado School Shooting
Crime-scene tape blocks off an area outside Arapahoe High School in Centennial, Colo., where police responded to reports of a shooting, Dec. 13, 2013.Ryan Parker/Denver PostColorado School Shooting
Police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.Ryan Parker/Denver PostColorado School Shooting
Police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.KDVR/AP PhotoColorado School Shooting
Police respond to reports of a shooting at Arapahoe High School in Centennial, Colo., Dec. 13, 2013.ABC News
