A former bartender at The Owl Bar in Anaconda, Montana, said the man accused of fatally shooting four people on Friday morning was not in a safe mental place. A manhunt is underway for Michael Paul Brown,

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."

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.