The cause of the 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.

The exact cause of the fire at the Gabriel House assisted living facility in Fall River may never be known, but investigators have narrowed the cause down to two possibilities, officials announced Tuesday afternoon.

Resident Steven Oldrid alleged that he was “trapped in his room, suffered smoke inhalation, respiratory distress, and loss of consciousness” during the July 13 blaze.