There are reports of at least two people injured and one person dead after a shooting at Arapahoe High School in Centennial, Colo.

Arapahoe County Sheriff Grayson Robinson told reporters this afternoon that the gunman was found dead inside the school with what appears to be a self-inflected gunshot wound. He was reportedly armed with a shotgun.

Police have the suspect's identity and he was a student, but they have not released the name. They have not located any other potential suspects at this point.

Another student is in a serious condition with a gunshot wound, according to Robinson, and there is a second student with a minor wound. The injured student is undergoing surgery.

The gunman was reportedly looking for a specific teacher, Robinson told reporters. The teacher exited the school when he heard the gunman was looking for him in an attempt to lure the gunman out of the building, according to Colorado police.

One student told ABC News: "I heard one shot fired. Then two more went off and I knew it was a gunshot after that and it echoed in the hallways."

Parents are being directed to the Shepherd of the Hills Church, according to the sheriff. Littleton Public Schools are reportedly now all on lockdown.

Denver Post reporter Ryan Parker is at the scene and tweeting details and pictures.

Students tell me 2 students were shot about 30 minutes ago. Shooter also shot, they say pic.twitter.com/NrK0nZzBzH — Ryan Parker (@ryanparkerdp) December 13, 2013

Students tell me they heard multiple shots coming from the cafeteria. Everyone ran out of school. — Ryan Parker (@ryanparkerdp) December 13, 2013

Students are evacuating the school:

A SWAT team might also be at the school:

SWAT team leading students away from #Arapahoe High School. Latest information here: http://t.co/Na1znGsgLS pic.twitter.com/m2GPyLSiAB — KDVR FOX31 Denver (@KDVR) December 13, 2013

This is a breaking news post. Check back for more information.