Two women severely burned in a camper explosion while staying at a Maine campground died of their injuries, according to state fire officials, who believe their deaths are linked to a gas leak.

Investigators believe a gas leak is what caused the explosion at a campground, which left two women with fatal burn injuries.

The two Massachusetts women who died from injuries suffered in a camper explosion at Old Orchard Beach in Maine smelled a strange odor and lit a candle prior to the fiery eruption, the Maine State Fire Marshal’s office said Monday.