FALL RIVER, Mass. ( WPRI) – Investigators have identified two potential causes of the deadly fire at an assisted living facility in Fall River, Massachusetts. But since they can’t pinpoint the exact origin, the cause of the fire has officially been ruled “undetermined.”

Smoking or an oxygen machine issue may have sparked the deadly fire at Gabriel House Assisted Living Facility in Fall River, Massachusetts, a state fire marshal said.

Ten people have died after a Massachusetts assisted living facility caught fire Sunday night, making elderly residents rush to their windows to scream and beg for help as smoke filled the hallways.