The fire that claimed nine lives at an assisted-living facility in Fall River, Massachusetts, "was destined to kill 50-plus people," according to the local fire chief.

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.

When the deadly fire broke out Sunday night at Gabriel House in Fall River, Massachusetts, the assisted living facility had 70 residents and just two staff members working, according to the mayor and an employee.

The Massachusetts assisted-living facility that caught fire Sunday evening was slated to undergo a recertification and compliance review process later this year.

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

A former employee said she never saw the staff perform fire drills. The local fire chief pushed back at claims that dispatching more firefighters would’ve saved more lives.

The investigation into the fire’s cause is ongoing but “does not appear to be suspicious,” according to the Bristol County district attorney's office.