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.

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

The deadly blaze was either started by a malfunctioning oxygen concentrator or smoking materials in a resident's room, ...

Careless smoking or a failure of an oxygen concentrator were eyed as possible causes of the fire that killed 10 and injured 30 in Fall River.

A fire that killed 10 people at a Massachusetts assisted-living facility was unintentionally caused by someone smoking or an ...