The cyberattack on supermarket refrigerators that France has blamed on Iran marks a new phase in the asymmetric campaign Tehran is waging against the United States, extending it onto European soil, analysts say.

Scores of French supermarkets were hit in the Oct. 11-12 cyberattacks, which raised the temperatures in their refrigerators, in some cases forcing them to throw away entire inventories of perishable food.

France said Iran’s Revolutionary Guard was behind the “unprecedented” cyberattacks, a charge Iran rejected.