Hy-Vee is warning customers about what it says is a security incident involving payment card systems.

Hy-Vee said it launched an investigation after it detected unauthorized activity on some of its payment processing systems — an activity that the company thinks has stopped, according to a press release.

The investigation looked at card payments at Hy-vee restaurants, fuel pumps, and drive-thru coffee shops. The press release says company officials think the problem doesn’t involve payments systems used inside its grocery stores, drugstores and convenience stores.

Hy-vee says they plan to notify customers when it can share specific timeframes and locations that may have been involved.