Multiple people were killed, including children, after a madman opened fire at a house in Montana before setting the property ablaze.

Police were called to the house in Billings just after 6 p.m. Sunday after reports of a shooting and a family disturbance, reported the Billings Gazette.

Officers arrived some 10 minutes later and heard gunfire from the back of the house, according to police.

Just three minutes later, the home was engulfed in flames.

“Multiple adults and multiple juveniles” died at the house, interim Yellowstone County Sheriff Kent O’Donnell told a news conference Monday, adding that the identities of the victims will not be released for now.

“Because of the fire and obviously water that goes to suppress that fire, it’s going to slow our investigation of the crime scene recovery of evidence. So we ask for patience as we complete this investigation,” he said.

No motive was publicly available as of Tuesday.

Neither the Billings Police Department, the Yellowstone County Sheriff’s Office, nor the Yellowstone County Coroner’s Office responded immediately to requests for comment.