Shocking reports have confirmed that at least two people have been injured at a school in Denver school and a shooter is still on the loose after three assailants opened fire.
The shots were reported at STEM School Highlands Ranch on Tuesday afternoon at 1.53pm.
According to local reports two people are said to be in custody and a third is still at large.
Witnesses say one person injured was seen being carried out by a cop on their shoulder.
Another was seen being taken out on a stretcher, according to a witness.
At least two have been injured but their conditions are not known.
The school serves children from Kindergarten to 12th grade.
Elementary school children were seen walking out of the school with their hands in the air.