Stymied by treacherous terrain and untamed wilderness, authorities are struggling to find an Army veteran suspected of killing four people at a Montana bar. But the difficult landscape isn’t the only challenge.

Police are looking for Michael Paul Brown, 45, after four people were shot and killed in The Owl Bar in the small town of Anaconda, Montana.

The suspect, 45-year-old Michael Paul Brown, lived next door to the bar, public records show. Authorities said a SWAT team cleared his home, and he was last spotted in the Stump Town area, just west of Anaconda. The massive manhunt continued into Friday evening in the wooded, mountainous area.