Authorities say a former US soldier suspected of killing four people at a Montana bar is still at large and believed to be armed.

The victims killed during a shooting at The Owl Bar in Anaconda, Montana, range in age from 59 to 74, Montana Attorney General Austin Knudsen said in a news conference Sunday.

The search for Michael Paul Brown, the suspect in the deaths of a bartender and three patrons at Owl Bar, continued into the weekend. Authorities have warned that he is armed and dangerous.