A waiter was shot to death in a restaurant just outside Paris by an impatient customer who lost his temper for having to wait for a sandwich, bystanders said.

The customer, who has not been identified, shot the waiter in the shoulder with a handgun after believing that the restaurant was taking too long to prepare his sandwich, according to several media reports.

Joshua Bote of USA Today  writes the restaurant, Mistral, is  in the Paris suburb of Noisy-le-Grand. The suburb is less than 10 miles east of Paris’ city center.

The waiter, 28, died on the scene.

The eatery, which mainly serves burgers and sandwiches, opened in March, according to its website.

The gunman has not been found as of Sunday.