Here are the companies and government agencies affected by the cyberattack sweeping the globe

Companies and government agencies in Ukraine, Russia, the UK, France, and Norway have reported ransomware demanding payment to unlock their files.

It's unclear who's behind the attack, which harks back to the WannaCry virus that affected 150 countries in May, or whether all of the reported issues are related.

The cyberattack continues to spread, as more entities are reporting being hit, but here's what we know it has struck so far:

UKRAINE: Banks, airports, government offices, power grid

Ukraine has been the hardest hit by the attack, which came one day before the country's Constitution Day. Companies and government officials reported major disruptions to the Ukrainian power grid, banks, government offices, and airports.

The radiation-monitoring system in Chernobyl, the site of a nuclear disaster in 1986, was also affected, Agence France-Presse reported. "Due to the temporary shutdown of the Windows system, the radiation monitoring of the industrial area is being done manually," the agency said on its website.

Anton Gerashchenko, an adviser to Ukraine's interior minister, wrote in a Facebook post that the attack was "the largest in the history of Ukraine."

RUSSIA: Banks, oil company, steelmaker

Russia's state-run Rosneft energy company also reported falling victim to hacking, but it said oil production wasn't affected. The Russian steelmaker Evraz also said its information systems were under attack but that its output wasn't affected.

The central bank of Russia said "computer attacks" had infected some IT systems of Russian banks. Citing an employee of the lender's call center, Reuters reported that all Russian branches of the Home Credit consumer lender were closed because of an attack.

FRANCE: Saint-Gobain

Saint-Gobain, a French construction-materials company, said it was also the victim of an attack, and a spokesman told Reuters that it was isolating computer systems to protect data.

UK: WPP

Britain's WPP, the world's largest advertising company, was also affected, the BBC reported.

NORWAY

Reuters reported that Norway's national-security authority said a ransomware attack was taking place at one of the country's companies, but they didn't name it.

GERMANY: Deutsche Post, Metro

The German postal and logistics company Deutsche Post and the wholesale retailer Metro both said their locations in Ukraine were part of the attack and that they were assessing the impact.

Mondelez International

The global food company Mondelez International said its employees were experiencing technical difficulties "in various geographies" but wasn't sure if it, too, was the victim of a cyberattack.

"The Mondelez International network is experiencing a global IT outage," the company said in a statement. "Our global special situations management team is in place, and they are working to resolve the situation as quickly as possible."

DENMARK: Maersk

The massive Danish shipping company A.P. Moller-Maersk, which is responsible for one out of seven containers shipped around the world, said its branches were affected.

"We can confirm that Maersk IT systems are down across multiple sites and business units due to a cyberattack. We continue to assess the situation," the company wrote on its website. "The safety of our employees, our operations, and customer's business is our top priority. We will update when we have more information."

UNITED STATES: Merck

The pharmaceutical giant Merck was hit, too.

Here are the companies and government agencies affected by the cyberattack sweeping the globe

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