As the search for 45-year-old Michael Brown closes in on one week, authorities are continuing their efforts to locate the suspect in a mass shooting at the Owl

The manhunt is focused on the wilderness area outside Anaconda, which local outdoor experts describe as particularly difficult to navigate.

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.