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.

River firefighters arrived at the scene Sunday to find some of the trapped residents screaming for help out of the windows.