Investigators searching for a man they say shot and killed four people at a Montana bar Friday morning have located the pickup truck he fled in, but the suspect — believed to be armed and dangerous — remains on the loose,

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