Unverified incident in Colorado

BREAKING: Colorado police are responding to what they called an attack at Boulder's Pearl Street Mall that left multiple people injured.

Authorities said the violent incident happened at 13th Street and Pearl Street on Sunday afternoon. Police asked everyone to avoid the area while first responders work the scene.

Video shows what appears to be a burn scar in front of the old courthouse and a person being taken away on a stretcher. Photos from a viewer show a shirtless man at the scene being detained by police.