Law enforcement officials are searching for a 45-year-old man accused of walking into a Montana bar and opening fire, killing four people, on Aug. 1.

The manhunt for Michael Brown continued in the mountains just west of Anaconda, where he is accused of fatally shooting four people in the Owl Bar, according to Lee Johnson, administrator of the state Division of Criminal Investigation. After the shooting at 10:30 a.m., Brown allegedly fled the scene in his white Ford F-150 truck. He remained at large as of 10 p.m. on Aug. 1, Johnson said in a nighttime update.

Law enforcement later found Brown’s truck, though didn’t locate him, Johnson said. Officials are now focusing their search in a mountainous area near Stumptown Road.

Officials said they believe Brown is armed and dangerous, though added they haven’t received reports of him harming others. Residents in the rural area have been notified and told to stay inside their homes, Johnson said. He’s described as 5 feet, 10 inches tall, weighs about 170 pounds, and has blue eyes and brown hair.

Earlier, the Granite County Sheriff’s Office said a suspect’s house in Anaconda had been cleared by SWAT as they warned people to avoid the area. Local, state and federal officials are involved in the ongoing search and investigation.

“This is a small tight knit community that has been harmed by the heinous actions of one individual who does not represent what this community or Montanans stand for,” Johnson said.