As the search for Michael Paul Brown stretched into its fifth day, Montana Gov. Greg Gianforte signed an executive order freeing up more resources for local law enforcement.

Four people were killed in a shooting at a bar in Anaconda, Montana, on Friday, authorities said. A suspect is at large.

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.