West Des Moines, Iowa-based Hy-Vee is warning consumers about a data incident involving its payment processing systems.

The company said in a news release that it has launched an investigation after detecting unauthorized activity in its payment systems that are focused on transactions at some Hy-Vee fuel pumps, drive-thru coffee shops and restaurants. The company says it believes the activity has stopped.

"After recently detecting unauthorized activity on some of our payment processing systems, we immediately began an investigation with the help of leading cybersecurity firms," the company's release says. "We also notified federal law enforcement and the payment card networks. We believe the actions we have taken have stopped the unauthorized activity on our payment processing systems."

The restaurants impacted are Hy-Vee's Market Grille and Market Grille Express locations, as well as the Wahlburgers locations owned and operated by the company.

Hy-Vee says those locations have different point-of-sale systems than those used in the grocery stores, drugstores and inside the company's c-stores.