Law enforcement officers are scouring a mountainous area of western Montana for a military veteran who authorities say opened fire at a bar, killing four people.

Following the tragic shooting at The Owl Bar in Anaconda, Montana, authorities are actively searching for Michael Paul Brown, a military veteran suspected of killing four people. His abandoned white Ford F-150 pickup truck was discovered,

Authorities were scouring a mountainous area of western Montana on Saturday for a military veteran who they say opened fire at a bar, killing four people. See footage from the scene in the video player above.