WSBT photo

House fire in the 69000 block of U.S. 31 south of Lakeville believed to have been arson. (WSBT photo) (July 29, 2012)

LAKEVILLE – St. Joseph County fire crews are investigating a house fire they suspect was a case of arson.

Four departments responded to the fire Saturday afternoon in the 69-thousand block of U.S. 31 just south of Lakeville.

Officers on the scene say they suspect the fire was set by an 18-year-old who lives there.

Several family pets were killed in the fire.

A man and his two sons live at the house.

Investigators say the family is going through a difficult time, and there was a fight between the father and the 18-year-old that may have led to the fire.

WSBT is told that police were moving ahead with an arrest against the teen.