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INDIAN HEAD, Md. (WUSA9) -- Fire marshals say a fire at a vacant water front mansion on Sunday afternoon started inside a three-car garage.

Investigators say the fire may have been intentional. They're looking for clues into the suspect or suspects responsible.

A boater first reported the fire just before 2 p.m. Sunday after seeing smoke coming from the 15,500 square foot mansion located at 5200 Rivers Edge Place.

Nearly 75 firefighters from numerous fire departments including Charles, Prince Georges and Fairfax counties as well as the Naval District Washington D.C. fire department responded to the scene.

The blaze was controlled within three hours, officials say. One firefighter was transported to Civista Hospital for heat related illness.

The mansion, located in the Potomac Heights neighborhood, was the former home of Robert J. Freeman, who was sentenced to 27 months after he plead guilty to obstructing bankruptcy proceedings in 2012.

PHOTOS: Potomac Heights mansion fire:http://on.wusa9.com/1paJg7N

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Anyone with information concerning this fire is asked to contact the Office of the State Fire Marshal - Southern Regional Office at 443-550-6820 or the Arson Hotline at 1-800-492-7529

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