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.

Authorities are searching for Michael Paul Brown, the suspect in a deadly shooting at a bar in Anaconda, Montana, that left four people dead.

Authorities urged residents to stay inside and on high alert because they consider Michael Paul Brown armed and dangerous.