DULUTH, Minn. (AP) — A man is dead after a house fire in a residential area of Duluth.

Firefighters were called about a person possibly inside a house engulfed in flames in Duluth's Lakeside neighborhood early Tuesday.

Assistant Duluth Fire Chief Chris Martinson says firefighters immediately began to battle the blaze and search for anyone inside. A thermal imaging camera revealed an unconscious man in the home.

Martinson says firefighters tried to revive the man, but he died. WDIO-TV reports no one else was hurt.

It took firefighters about four hours to bring the fire under control. The house is a total loss, with damage estimated at $150,000.

The cause of the fire is under investigation. It was the fourth fatal fire in the Duluth area in the past month.