Tragic news for a Tennessee family who probably wishes they hadn’t carried around a loaded gun:

Officers say four children had been left in the car while their mother and step-father were inside the building a short distance away, paying a bill.

Police say the boy’s 8-year-old brother fired the gun. The 7-year-old boy was bleeding from the head.

Investigators say one of the children found a loaded semi-automatic pistol in their mother’s purse. They say the child tried to unload the weapon by removing the magazine when the gun discharged.

The boy was transferred to a nearby trauma center where he later died. The Department of Children’s Services in Tennessee has opened an investigation.