A manhunt is intensifying for the gunman who allegedly killed a bartender and three patrons at a bar in southwestern Montana, authorities said. Michael Paul Brown allegedly opened fire around 10:30 a.m. local time Friday at The Owl Bar in Anaconda, a city of about 9,000 people in southwestern Montana, according to the Montana Department of Justice.

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.

Those killed on Friday were a bartender and three patrons, ranging in age from 59 to 74, the authorities said. The suspect fled into the nearby foothills.