Montana's Attorney General warned the suspect "is an unstable individual who walked in and murdered four people in cold blood for no reason whatsoever."

Police say the suspect was "a regular" at the bar where he opened fire, and that a bartender and three patrons were among the victims.

Amid an ongoing manhunt Montana authorities warned the public Sunday that Michael Paul Brown, the suspect accused of killing four people in a Montana bar on Friday morning, could return to Anaconda, the town where the shooting occurred at the Owl Bar.