Las Vegas police are investigating how a 5-year-old boy apparently found a gun inside a car and accidentally shot himself in the head.

Police say the boy and his father were going through a drive-through window at a Walgreens on Monday night when the boy found a gun.

They say he fired it once, hitting himself in the head, and that his father then rushed him to a hospital.

The boy is at the University Medical Center's trauma unit in stable condition.