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.

Officers are "unrelenting in their pursuit, working around the clock" to find him, Montana Gov. Greg Gianforte stressed at a news conference on Tuesday. "Rest assured, our brave men and women of law enforcement aren’t giving up."

The search for a military veteran suspected of fatally shooting four people at a Montana bar has stretched into its fifth day. Authorities in Anaconda have increased the reward for information leading to his arrest.