Cyberattacks are wreaking havoc on an unlikely target across Europe: supermarket refrigerators.

Why it matters: Hackers are turning everyday, internet-connected equipment into physical hazards, spoiling food and causing costly damage.

U.S. supermarkets use similar technology, and the Pentagon is already investigating suspected cyberattacks involving refrigeration systems at six military commissaries.

Driving the news: Suspected cyberattacks sent refrigerator and freezer temperatures soaring at dozens of European supermarkets overnight, spoiling food and threatening costly losses.

Grocery chains Ahold Delhaize and Colruyt reported incidents affecting stores in Belgium and Luxembourg, while Swedish chains ICA and Coop reported similar disruptions, per Reuters.

A Belgian company that operates Delhaize's refrigeration systems said hackers switched the units into defrost mode.

Here's what to know.

Supermarkets hacked in Europe

Supermarkets in Belgium, Estonia, Finland, Ireland, Luxembourg, the Netherlands…