DAYTON, Ohio -- Investigators said smoking around a gas heater may have been the cause of an explosion at a Jefferson Township home that left a man severely burned.

It happened Friday night just after 10 p.m. on Calumet Lane near West Third Street in Jefferson Township.

42-year-old John Kennedy was taken to Miami Valley Hospital third degree burns over 75 percent of his body. He remained in critical condition Monday morning.

Part of the house had been blown away and pieces of the house were strewn in the front yard and the street.

Fire crews say neither electricity nor natural gas were hooked up in the house, but the man was using a kerosene or propane heater for heat.