Nine people were killed and one was critically injured in an assisted living home fire in Fall River, Massachusetts, authorities said. Fall River Fire Chief Jeffrey Bacon called the fire at Gabriel House "an unfathomable tragedy.

Local and state fire investigators are working to identify the origin and cause of the 5-alarm at Gabriel House on Oliver Street, officials said.

Calls to 911 reporting a fire at an assisted-living facility in Fall River, Massachusetts, began coming in shortly after 9:30 p.m. Sunday, marking the start of a prolonged emergency response to rescue the roughly 70 people who lived there,