Gabriel House fire in Fall River, Massachusetts may have been caused by smoking or oxygen device failure

The cause of the deadly fire at the Gabriel House assisted living home in Fall River, Massachusetts last week is still officially undetermined, but investigators have narrowed it down to two possibilities: smoking or the failure of a resident's oxygen device.

State Fire Marshal Jon Davine said the fire started in a resident's room on the left side of the second floor. Investigators found an oxygen concentrator and numerous smoking materials in the room.

"Tragically the occupant was among those who lost their lives on July 13th. And we could not speak to that resident and get an account of the fire at its earliest stages," Davine said. "As a result, the available evidence left to them was two possible causes - one was an electrical or mechanical failure involving the oxygen concentra