The Massachusetts assisted-living facility where a fatal fire killed nine people was caring for dozens of aging residents reliant on wheelchairs and oxygen tanks, but it lacked the safety measures and most of the staffing requirements that are commonplace in nursing homes.

As an assisted-living center, Gabriel House in , about 50 miles (80 kilometers) south of Boston, offered a type of housing for older residents that has expanded nationally in recent decades. But advocates argue that the absence of any federal regulations and spotty state rules mean the sector is largely left to police itself.

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