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Authorities said a July 13 fire that ravaged a Fall River, Massachusetts, assisted-living facility, killing 10 people and injuring more than 30 others, was an accident that may have been sparked by either a malfunctioning oxygen machine or the careless use or disposal of smoking materials.

State Fire Marshal John Davin said during a news conference Tuesday the Gabriel House Assisted Living Facility fire started in a resident's room on the second floor of the building.

However, when authorities investigated and conducted initial interviews, they found the fire did not appear to have been set intentionally, according to Bristol County District Attorney Thomas Quinn.

"[Authorities] found no signs that cooking, lighting, he

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