Authorities in central Minnesota say two people are dead from carbon monoxide poisoning after alternative energy sources were used to heat a home.

According to the Mille Lacs County Sheriff’s Office, deputies responded to a call about a possible overdose shortly after 8 p.m. Sunday in the 1600 block of 110th Avenue in Princeton Township, west of Princeton.

When deputies responded to the residence, Marcos Larson, 27, of Princeton, was found dead in an upstairs bedroom. A Labrador retriever was also found semiconscious.

Deputies checked the rest of the house and found Kyle May, 20, of Princeton, dead along with a deceased cat.

The 911 caller, Hope Lockrem, 19, of Princeton, was transported to the Princeton hospital to be treated for carbon monoxide exposure. She was later transferred to Hennepin County Medical Center in Minneapolis. Her condition was unknown Monday.

The dog was treated at a local veterinary hospital. Its condition was also unknown.

The Princeton Fire Department determined there were lethal amounts of carbon monoxide, a colorless, odorless gas that’s a byproduct of combustion.

The sheriff’s office said it appears the occupants of the house were using a gas-powered generator to operate space heaters. Propane heaters were also being used. There was no permanent power source or running water in the house.

Mille Lacs County Sheriff Kyle Burton said that it is never safe to run combustion engines inside an enclosed space. Burton also urged residents to make sure they have working carbon monoxide alarms.

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