"Residents of the area have been notified and are encouraged to stay inside heir homes and on high alert," Johnson said. Authorities haven't said what led up to the shooting at the bar or a possible motive. Police have identified the four people killed but are not yet releasing their names until they've have had a chance to talk to family members,

Authorities have launched a manhunt after a shooting at a Montana bar left four people dead. State investigators said the shooting happened Friday morning at The Owl Bar in Anaconda.

State authorities are hunting for the suspect, thought to be armed.