In Belgium, Luxembourg and Sweden, hackers broke into the control system of supermarket refrigerators and raised the temperature in the freezers, according to the Guardian. Dozens of stores of the Dutch multinational company Ahold Delhaize in Belgium and Luxembourg were affected by the hacker attack. Last month, the company also reported hacks to the company's stores in the Netherlands. The attack also affected the Swedish supermarkets ICA and Coop. In one of the supermarkets, hackers set the temperature in the freezer to 50 degrees Celsius.