Reported by BBC World
Freezers have had to be emptied at several ICA grocery stores in Sweden after the cyber-attack
Dozens of supermarkets across seven European countries have been hit by a cyber-attack affecting their refrigerators and freezers.
Around 40 Delhaize supermarkets in Belgium and Luxembourg were affected, while a smaller number of shops were hit in Sweden, Ireland, the Netherlands, Estonia and Finland.
More from the original report
Sabcobel, a Belgian company that manufactures some of the affected refrigerators, said the units' evaporators were switched to defrost mode, causing them to warm up, in what is believed to be the same method used in last month's incident that hit hundreds of French supermarkets.
Millions of euros worth of food had to be thrown away in October, local media reported at the time.
Stephan Moelans, the CEO of Sabcobel, which operates Delhaize's systems, on Monday told the Belga news agency that the incident was a cyber-attack and that the company had been "working all night and morning to disconnect the affected units from the network".
He said since the French attack in early October, the company had been working to "protect our customers fridges against this vulnerability" but that the units needed physical modifications, not just software updates.
Most supermarkets across Europe are linked to the internet, and maintenance and troubleshooting can be done remotely.
"The simplest solution is to manage the fridges over a secure internet connection. Most of our customers switched to that after the attack in France," Moelans added.
The temperature of freezers in several shops across Europe reportedly rose to as high as 50C (122F).
In the US, authorities are investigating what caused refrigeration malfunctions at a number of American military bases in August and working together with French officials to examine whether the incidents could be linked.
Both Belgium and Sweden's national cyber-security agencies said they were monitoring the incident.
The UK's National Cyber Security Centre said it was working with international partners and industry to "fully understand details of an incident". No incidents have been reported in the UK.
In Flanders, northern Belgium, a Delhaize branch in Hoeilaart told news website Het Laatste…