Refrigerators at three regional blood banks in ‌France have been hit by a cyber attack at the same time as hackers struck supermarkets from Sweden to Belgium.

“Several regional facilities of the French Blood Establishment (EFS) were affected by a cybersecurity incident that impacted certain cold storage room ‌monitoring and control systems,” ‌the French health ⁠ministry said.

EFS spokesperson Charley Dubois said the incident overnight between Sunday and Monday (local time) did not affect blood supplies.

“We have staff round the clock, since blood can be needed at any time. They were warned about the problems by alerts and moved the blood to other refrigerators that were not connected,” she said.

Around ⁠the same time, hackers tampered with ‌refrigerators ​at stores in eight European countries, forcing retailers to discard large quantities of food. That attack ‌that echoed an incident affecting dozens of supermarkets in France three weeks ​earlier.

The situation was under control on Wednesday, the health ministry said, adding that remote access to the affected refrigerators had been disabled.

Investigations continue ​into how the attack was ​carried out, what equipment may have been affected ‌and when systems can safely return to service.

The attack followed a similar incident in France last month when police said hackers seized control of cooling units at hundreds of supermarkets, causing fires and food losses.

The incidents have raised concerns ​in the European Union about unsuspected vulnerabilities in connected infrastructure amid growing security tensions ​since Russia’s 2022 ⁠invasion of Ukraine.