The former U.S. Army soldier accused of gunning down four people at a Montana bar has been captured following a weeklong manhunt.

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.

The suspect in a mass shooting that killed a bartender and three patrons at a bar in Montana has been arrested after a week-long manhunt. Michael Brown, a 45-year-old U.S. Army veteran, is accused of fatally shooting four people with a rifle at the Owl Bar in the tight-knit community of Anaconda on August 1.