Mysterious cyberattacks on European supermarket fridges have sent officials around the continent scrambling to figure out the cold, hard facts.

Supermarkets in a number of European countries reported this week that their fridges and freezers warmed up after they were remotely taken over, resulting in tons of spoiled food at a total cost of millions of dollars (euros).

One Swedish supermarket said its fridges and freezers had been hacked and set to 50 degrees Celsius (122 degrees Fahrenheit).

It's a repeat of an earlier incident that struck refrigeration systems in hundreds of supermarkets and independent stores across France , Belgium and the Netherlands.

Here's a closer look:

What happened and who was affected

Supermarkets in at least half a dozen European countries, including Sweden, Belgium, Luxembourg, Ireland, Italy and Estonia, reported problems on Monday.

It wasn't just big chains.

The owner of a butcher shop in Athens told private Greek Skai TV Tuesday that someone hacked into the temperature…