The cause of 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.

The cause of a fire at a Massachusetts assisted-living facility that left 10 people dead remains undetermined for now as officials investigate whether smoking materials and an issue with a medical oxygen machine may have been factors,

Officials announced a preliminary investigation shows a oxygen tank malfunction or smoking may have caused the deadly Fall River assisted living facility fire that claimed the lives of 10 last