Michael Paul Brown, 45, fled The Owl Bar in the small town of Anaconda in a white pickup truck but ditched it at some point, officials said.

Authorities said the suspect in a shooting at The Owl Bar in Anaconda, Montana, was believed to be armed and dangerous.

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.