The U.S. government is warning of an “ongoing cyber threat” facing industrial refrigeration units, after reports of cyberattacks targeting freezers and fridges in supermarkets around the world, U.S. military bases, and at least one blood bank.

U.S. cybersecurity agency CISA, the FBI, and several other federal government departments warned in a joint statement on Thursday that hackers are targeting and compromising internet-connected refrigeration and cold chain monitoring systems in grocery stores and cold storage facilities. The statement said that the hacks are hitting critical infrastructure, such as the food, agriculture, transportation, and medicine-shipping industries.

“If successfully exploited, the actors could change the temperature and possibly cause physical impacts such as fire hazards, loss of inventory and changes to the service life of the system,” the agencies warn.

The warning comes after several waves of cyberattacks targeting industrial refrigeration units across the United Kingdom and Europe in recent weeks. Two separate waves of attacks allowed hackers to crank up the temperature on freezers and chilling units in at least a dozen countries, spoiling defrosted food and destroying produce. Some of the affected systems included remote-controlled refrigeration units made by Danish company Danfoss, which had stopped providing security updates to its customers’ freezers.

Hackers also targeted a blood bank in France, causing its refrigerated units to boost temperatures in its cold units containing donated blood supplies — but were stopped before the attack could compromise blood stores. S. Department of Defense is investigating a spate of hacks targeting freezers run by the military, according to Reuters .

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