Hackers accessed refrigeration systems remotely.
Temperatures rose to about 122 degrees Fahrenheit (50°C).
Stores in Belgium, Luxembourg, Sweden, Estonia, and France were hit.
Authorities are investigating the source of the attack.
The machines were set to a warm mode, making freezers reach about 50 degrees Celsius.
Food like milk and ice cream could spoil, and some stores even saw small fires.
The stores are working with police to fix the problem and protect the computers.
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