No Active Shooter at Columbine High School in Clements Park, Colorado.

One suspect was being treated for injuries at Clement Park on Monday after Columbine High School was placed on a secure perimeter.

That secure perimeter means that no one is allowed to enter or leave the campus but all school activities continue as scheduled inside the building. 

According to the Jefferson County Sheriff's Office, there's a "large police presence in the area of W Bowles Ave and S Pierce. Initial info indicates an officer-involved shooting; suspect is being treated on scene and no officers were injured."