Elderly residents – some in wheelchairs and some dependent on oxygen tanks – were blinded by deadly smoke as they tried to escape an assisted-living facility in Fall River, Massachusetts, which caught fire Sunday evening.

According to Fire Chief Jeffrey Bacon, the blaze started in a room on the second floor on the east side of the Gabriel House building, but details about the exact origin and cause are under investigation.

A tenth person has died after a fire tore through a Massachusetts assisted living facility. Bristol County District Attorney Thomas Quinn announced the death of 66-year-old Brenda Cropper on Thursday, July 17, according to CBS affiliate WBZ-TV, MassLive and NPR station WBUR .