Deputies spent Saturday traversing a rugged mountainous area of Montana with helicopters overhead as a manhunt for a military veteran suspected of fatally shooting four people at a bar stretched into a second day with no capture.

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.

Authorities urged residents to stay inside and on high alert because they consider Michael Paul Brown armed and dangerous.