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(KMOV) -- Investigators have ruled that a fatal fire in Ferguson was an accident that may have been started by smoking.

Family members tell News 4 that Willie Mae Freeman, 88, and Jonnie Mae Freeman, 57 died in that fire. They were a mother and daughter that lived together in the home.

The fire happened Monday morning in the 7500 block of Rowles. A neighbor saw the flames around 5:00 a.m. on Monday morning.

By the time firefighters arrived, three rooms in the small home were engulfed.

The Freeman home had no working smoke detectors.