Four were reportedly killed at the Owl Bar in Anaconda, Montana after a gunman, believed to be armed with an AR-15-style rifle, opened bar inside or near the bar, reports claimed. The incident sparked a citywide emergency response forcing businesses to close.

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, said Lee Johnson, administrator of the Montana Division of Criminal Investigation, which is overseeing the case. He urged residents late Friday to stay at home and on high alert.

Authorities are scouring a mountainous area of western Montana for a military veteran who they say opened fire at a bar, killing four people. 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,