If you’ve been trying to use the Hannaford app for the last week, you’ve probably noticed a problem. Hannaford’s website has been down and shoppers who try accessing it, or the app will get an error message that mentions technical issues and the supermarket chain’s efforts to get back online as soon as possible. The company says a cybersecurity issue is behind the site shutdown and it has taken systems offline while it sorts the issue out. The company has not said if customer data is at risk.