Parts of a national forest near Anaconda, Montana, were closed late Saturday as authorities expanded their search for the gunman accused of killing four people at a bar on Friday morning.

The search for Michael Paul Brown, the suspect in the deaths of a bartender and three patrons at Owl Bar, continued into the weekend. Authorities have warned that he is armed and dangerous.

A manhunt is underway after a deadly shooting inside a Montana business on Friday. Four people were killed at The Owl Bar in Anaconda, according to the Montana Division of Criminal Investigation. Police identified Michael Paul Brown, 45, as the suspect.