The father of a 6-year-old boy has been accused of carving a pentagram on the child's back.

Richland Hills police Sgt. Nathan Stringer says officers planned to speak with the boy Thursday about the attack a day earlier. Police say the child's father called 911 and said he inscribed a pentagram on his son because it was "a holy day."

It is not clear which faith he was referring to. Wednesday's date was 12-12-12, a once-in-a-century event.

Brent Troy Bartel was being held in jail on a charge of aggravated assault with a deadly weapon. Police say they plan to seek a mental evaluation.

Stringer says the child was discharged from the hospital Wednesday night from a Fort Worth hospital. Details on his treatment weren't immediately available.