An 8-year-old boy has died after accidentally shooting himself with a loaded gun left in a car while his mother was inside an Utah convenience store, police said.

The boy was alone in the car about 7:40 p.m. Monday in Lehi — a city about 30 miles south of Salt Lake City — when he shot himself in the head, Jeanteil Livingston with the Lehi City Police Department confirmed to CBS News. The incident occurred in a vehicle located in the parking lot of a Maverick gas station, police said.

The boy was taken to a local hospital in extremely critical condition. He was later airlifted to a hospital up north and died Tuesday morning, police said.