It happened in Pittsburgh:

A nun and local school principal chased down a would-be wallet snatcher Tuesday afternoon, said police.

Channel 11 News has learned that the principal of Sacred Heart School in Shadyside chased after a man who took a mother’s wallet outside of the school.

Diocesean officials said the mother left her car running as she went inside the school to pick her son up.

That’s when police said the man grabbed a wallet inside the car.

Principal Sister Lynn Rettinger said she saw the man steal the wallet through a window. After catching up with the man, Rettinger asked if “he had something that didn’t belong to him.”

The man told Rettinger that he did and gave the wallet back. Police are still searching for the suspect.