The manhunt for the person who opened fire and killed four people at a Montana bar stretched into its fourth day Monday.

A manhunt is intensifying for the former U.S. Army soldier who's been at large for days after allegedly gunning down four people at a Montana bar. Michael Paul Brown, 45, is suspected of opening fire on Friday morning at The Owl Bar in Anaconda, a city of about 9,000 people in southwestern Montana, authorities said.

Four people were killed in the attack inside the Owl Bar in Anaconda, Mont. The authorities are still searching for the suspect, an Army veteran who lived nearby.