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 victims, all local residents of Anaconda, Montana have been identified as 59-year-old Daniel Edwin Baillie, 64-year-old Nancy Lauretta Kelley, 70-year-old David Allen Leach, and 74-year-old Tony Wayne Palm, Knudsen said in a news release.