Emergency crews found two people with critical injuries, but they continued searching for a third person who was in the house at the time of the explosion, Cache County Sheriff Lt. Mikelshan Bartschi told The Herald Journal on Thursday night. By midnight they had found the male occupant, John Mullin, deceased in the home’s basement.

The two injured were sent to area hospitals.

One of the injured, Joshua Mullin, was thrown from the house when the explosion occurred, Bartschi said. He was taken to Cache Valley Hospital with multiple burns on his arms, chest and face.

The other, Carolyn Mullin, was found trapped under debris, calling for help. She was taken to Logan Regional Hospital with multiple fractures and burns to her body, according to information from the sheriff’s office, and later by air ambulance to McKay Dee Hospital in Ogden for additional care.

On Friday, the sheriff’s office released body camera footage of crews working the wreckage.

According to the sheriff’s office, the Mullins family are professional dog breeders, and about 30 dogs were on the property in a separate structure at the time of the explosion. Sixteen dogs were in the home at the time; five were found alive about five hours after the explosion and taken to New Vision Intake and Animal Shelter for treatment.

Of the five dogs, three are in critical condition. All other dogs on the property are being taken care of by family members, according to the sheriff’s office.

Cache Fire Chief Rodney Hammer told reporters Friday morning it was not known what caused the explosion — the sheriff’s office said it did not want to speculate about the cause — but the state fire marshal and a propane expert are investigating. He did say, however, that people should check their propane for ice and snow buildup and make sure tanks are in proper working condition.

“They are rare,” he said of the explosion, “but we have had a few of these in the valley.”

Bartschi said firefighters braved going into the collapsed and burning house to rescue the individuals caught in the rubble. The two injured were still listed in critical condition at area hospitals on Friday, he said.

Multiple agencies responded to the incident, which remains under investigation.

“There’s not much left standing of the house,” he said, noting that one wall was about all that remained upright.