Hy-Vee is investigating a “security incident” that may have affected some customers’ payment information. The breach may have affected customers who made payments at fuel pumps, as well as the Hy-Vee Market Grill, Market Grill Express and Wahlburgers.

Hy-Vee officials say the payment systems used for Hy-Vee grocery stores, drug stores and online sales are separate and are not involved in the potential security breach. There are no details yet on the specific locations that may have been hit by the hackers.