Authorities are searching for 45-year-old military veteran Michael Paul Brown who killed four people at a Montana bar on Aug. 1.

At least four are dead in a shooting happened at about 10:30 a.m. local time at The Owl Bar in Anaconda, according to the Montana Department of Justice. A manhunt is intensifying for the gunman who allegedly killed a bartender and three patrons at a bar in southwestern Montana, authorities said.