May 24, 2016 01:00 PM

Police in Missouri are investigating the deaths of a couple and their 11-month-old daughter – whose bodies were found Sunday amid the scorched aftermath of an early morning house fire – as potential homicides, because two of the corpses bore gunshot wounds, PEOPLE confirms.

The St. Louis Police Department claims that Melvin Thomas, 56, and Marquita Jones, 31, were both shot before the ignition of Sunday’s blaze.

Their infant daughter, Madison Thomas, was found in a room on the first floor of the gutted home.

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Detectives claim that the fire broke out at just before 5 a.m. on Sunday. A neighbor spotted flames shooting from a bedroom window and called 911.

Fire investigators say the house had working smoke detectors and that they are still working to determine what caused the conflagration.

A police spokesman tells PEOPLE the couple had recently moved to the area.

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