Efforts to investigate the cybersecurity “issue” prompted the grocery giant's parent company to disconnect some systems to protect them.

The parent company of Stop & Shop and Hannaford grocery stores has issued a statement saying they were recently impacted by a “cybersecurity issue within its U.S. network.”

On Friday the parent company of Stop & Shop, Ahold Delhaize, released a statement that said an investigation is being conducted after a recent cybersecurity issue within its U.S. network. Their security team along with outside cybersecurity experts are working to detect the issue and take steps to further protect their systems.