Supermarket giants across Europe have warned of a fresh string of cyberattacks as fridge and freezer temperatures unexpectedly spike.

An IT incident overnight hit fridges and freezers in dozens of stores across Belgium , Estonia and Luxembourg, retailers Ahold Delhaize, Carrefour and Colruyt said on Monday.

Swedish grocers ICA and Coop, as well as an Ikea superstore also reported similar temperature increases, with one store explicitly blaming a cyberattack.

In Ireland, refrigeration systems at 13 SuperValu stores were also impacted by a suspected cyberattack.

It comes after Dutch retailer Ahold Delhaize reported a cyber security incident to police in October after detecting “suspicious activity” in its infrastructure.…