French authorities said a cyberattack on several blood banks sought to raise temperatures to extremely high levels and was thwarted before it could do any damage to blood products or samples.

The French Blood Establishment (EFS) said “temperature and defrosting thresholds were raised to extremely high levels” on Monday at three of its cold-storage sites for plasma, and that no health consequences were identified and no blood products were lost. The attack hit a supplier of refrigeration equipment at three EFS sites. France's national cybersecurity agency and the Health Ministry are investigating the incident. The incident comes after supermarkets in several European countries reported that their fridges and freezers warmed up after being remotely taken over, with tons of spoiled food at a total cost of millions of dollars.