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

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.

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.