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.

A fire that killed 10 people at a Massachusetts assisted-living facility was unintentionally caused by someone smoking or an electrical issue with an oxygen machine, investigators said Tuesday The sta

The state’s fire marshal said the fire was either caused by an electrical or “mechanical failure” involving the oxygen device, or by improper use of smoking materials.