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.

Michael Paul Brown, 45, fled The Owl Bar in the small town of Anaconda in a white pickup before ditching it at some point, according to Lee Johnson, administrator of the Montana Division of Criminal Investigation, which is overseeing the case. He urged residents late Friday to stay at home and remain on high alert.

Authorities released a photo of the suspect, said to be taken as he fled after the shooting: Gaunt, barefoot and wearing nothing but black shorts, he is seen walking down what appears to be a flight of outdoor concrete steps.