The last confirmed sighting of the suspect, Michael Brown, was on Aug. 1, officials reported on Tuesday, July 5.

The manhunt for an Army veteran suspected of killing four people at a bar he frequented has expanded in the rugged Montana terrain, authorities said.

Authorities are searching for Army veteran Michael Paul Brown, accused of shooting dead Nancy Kelley, Daniel Baillie, David Leach and Tony Palm inside a bar in Anaconda

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 manhunt in Montana is on day 5 for a former U.S. Army soldier on the run days after he allegedly shot and killed four at a local bar in the southwest part of the Treasure State.