Denver police respond to reports of 2 people shot, 1 stabbed

Emergency and police vehicles are seen outside the Denver Coliseum in this picture released by the Denver Police Department, in Denver, Colorado, January 30, 2016.

Denver police said they responded to a stabbing and shooting at the Denver Coliseum on Saturday, which left one person dead and multiple people injured.

At least nine people were taken to area hospitals, according to Denver Health, a regional healthcare provider.

There was a large police presence near Denver Health, which was placed on lockdown as a precaution.

The Colorado Motorcycle Expo is being held this weekend at the Coliseum on the National Western Stockshow complex.

The Denver Post reported that one witness, who asked to remain anonymous out of fear of retaliation, said violence broke out after a feud started between rival biker gangs.

Shots were fired with at least one stabbing, police say.

This story is developing, check back for more details.