The Army veteran suspected of killing four people at a Montana bar last week was still at large Sunday and may still be armed after escaping in a stolen vehicle containing clothes and camping gear, officials said.

Police say the suspect was "a regular" at the bar where he opened fire, and that a bartender and three patrons were among the victims.

Montana's Attorney General warned the suspect "is an unstable individual who walked in and murdered four people in cold blood for no reason whatsoever."