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."

The mental health of suspected Montana gunman Michael Paul Brown, 45, declined significantly following the death of his mother, relatives said.