PARIS (AP) — Cyberattacks have disrupted European supermarket chains, causing refrigeration systems to overheat at hundreds of stores in France and forcing a major grocer to shut down websites serving customers in Europe and the United States.

French Finance Minister Roland Lescure told Parliament on Tuesday that about 700 of the country’s 10,000 supermarkets were affected. He said there was no risk to France’s food supplies but acknowledged that the attack “touches the heart of our food security.”

″It was a wake-up call for everyone,” he said.

The Paris prosecutor’s office said Tuesday that its cybercrime unit was investigating the large-scale attack, including the extent of damage caused by spoiled food and possible fires.

Dominique Schelcher, CEO of French grocery chain Cooperative U, said 80 of the company’s 2,000 stores were affected. Most managed to prevent disruptions to refrigeration, but some had to discard food, he said in a post on X.

“Targeting equipment essential to the preservation of fresh products is an attack on the French food supply chain. It is unprecedented, extremely serious, and unacceptable,” Schelcher said.