FRESNO (AP) — Fresno authorities say a baby boy died of heat exposure after he was unintentionally left in a car for an hour as the temperature reached 101 degrees.

The Fresno Fire Department said Saturday the 15-month-old was left inside the vehicle outside his family’s home in southwest Fresno on Friday evening. The rest of the family had taken groceries out of the car and went into the house, believing the boy was with his father.

A female bystander performed cardiopulmonary resuscitation on the baby before paramedics arrived. The boy was taken to a hospital where he was pronounced dead.

Police say no wrongdoing was found in the incident, calling it a tragic accident.