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DULUTH, Ga. -- Gwinnett County Fire officials are working to determine the cause of a Tuesday morning fire at a vacant house.

The fully involved fire was first reported just after midnight at a home on Hopkins Mill Road in Duluth. Firefighters had to battle the blaze from the outside before going into the single-story house.

Fire officials said the home was a total loss.

Gwinnett County Fire Capt. Tommy Rutledge said no utilities were connected to the house and there was no reason for a fire to start.

Neighbors told investigators that squatters often stayed in the home, but no one was inside when the fire broke out, Rutledge said. The blaze has not yet been ruled arson.

Fire officials are now trying to contact the owner of the house.