Ahold Delhaize USA, the parent company of Hannaford Supermarkets, says it recently detected a cybersecurity issue within its U.S. network.According to a statement from the company, Ahold Delhaize security teams began an investigation with the help of external cybersecurity experts immediately upon detecting the issue and notified law enforcement. Ahold Delhaize said its teams are taking steps to assess and mitigate the issue, including “taking some systems offline to help protect them.”The cybersecurity issue and subsequent mitigating actions have affected certain Ahold Delhaize USA brands and services, including a number of pharmacies and e-commerce operations.Hannaford Supermarkets, which has nearly 70 locations in Maine, announced Thursday that its website, pharmacies and some of its stores were experiencing a network issue.On Thursday, Maine’s Total Coverage reporter Bonnie Bishop discovered a sign posted on the door of the Hannaford store on Riverside Street in Portland that stated the location was unable to accept …