BROKEN ARROW, Okla. >> An Oklahoma couple considered “primary suspects” in last week’s killings of their six children faced growing financial pressures and the husband experienced recurring pain from a workplace head injury, family members say.

Eight people were found dead Thursday in a burning home in a Tulsa-area suburb in what authorities are investigating as a murder-suicide. The Broken Arrow Police Department on Sunday identified the two adults as Brian and Brittney Nelson but provided no new information on whether both adults were involved in the killings of the children, who ranged in age from 1 to 13.

All six children were found dead in a burning back bedroom and the two adults were found in the front of the home.

Authorities said causes of death were still pending but they don’t believe anyone died from the fire.

– The Associated Press