A Montana city is on lockdown after four people were killed in a bar by an active shooter.

A shelter in place is in effect for Anaconda after a suspect identified by police as Michael Paul Brown, 45, allegedly opened fire inside Owl Bar in the city on Friday.

One person who spoke with MTN News said they had been at a nearby bar and saw the shooter walking around with a rifle.

Brown is armed and dangerous, according to The Anaconda Deer-Lodge County Law Enforcement Center which released an image of him amid the manhunt.

Officials said that he was last seen wearing a tie-dyed t shirt, blue jeans and an orange bandana.