Massachusetts fire marshal reports the Gabriel House fire that killed 10 and injured over 30 was accidental, possibly sparked by a resident smoking or a mechanical issue.

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

A resident is suing a Massachusetts assisted-living facility, claiming poor safety protocols left him trapped during the deadly fire.

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.

All 273 assisted living facilities in Massachusetts will be required to send a letter to all residents and families detailing fire safety protocols.

More than 75 percent of Gabriel House residents are enrolled in Medicaid, state officials have said, and it charges significantly less than a typical assisted living facility does for private-paying patients.