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.

Blake Hempstead, a local sports reporter in the area, posted on X, "Anaconda is in a mini lock down while police search for a gunman who shot numerous people at the Owl Bar. Don't leave your house or come this way until this cowardly POS is found by our law enforcement officers."