An estimated 150-200 Intermarché shops were targeted, along with almost 100 Cooperative U outlets

French supermarket chains Intermarché and Cooperative U have been hit by an “unprecedented” cyber-attack that caused their refrigerators to defrost, the two retailers have said.

An estimated 150-200 Intermarché shops were targeted, along with almost 100 Cooperative U outlets, in the attack, they said on Monday.