The ‘Petya’ cyber attack is affecting major companies around the world.

, which crippled the NHS in May, initially attacked businesses in Ukraine, but has spread to more countries, including Russia and the UK.

It’s locking users out of their computers, and demanding a payment of $300 in Bitcoin from them.

However, experts have warned against paying the ransom, as doing so could encourage similar attacks in the future.

These are the companies and organisations that have confirmed they’ve been affected by the Petya attack.

Gadgets and tech news in pictures Gadgets and tech news in pictures Rosneft

Russia’s top oil producer Rosneft said its servers had been hit been a large-scale cyber attack but its oil production was unaffected.

A.P. Moller-Maersk

Danish shipping giant A.P. Moller-Maersk, which handles one out of seven containers shipped globally, said a cyber attack had caused outages at its computer systems across the world.

Maersk’s port operator APM Terminals was also hit. Dutch broadcaster RTV Rijnmond reported that 17 shipping container terminals run by APM Terminals had been hacked, including two in Rotterdam and 15 in other parts of the world.

WPP

Britain’s WPP, the world’s biggest advertising company, said computer systems within several of its agencies had been hit by a suspected cyber attack.

Merck & Co.

Pharmaceutical company Merck & Co. said in a tweet its computer network was compromised as part of a global hack.

Russian Banks

Russia’s central bank said there had been “computer attacks” on Russian banks and that in isolated cases their IT systems had been infected.

All Russian branches of Home Credit consumer lender are closed because of a cyber attack, an employee of a Home Credit call centre in Russia said.

Ukrainian Banks, Power Grid

A number of Ukrainian banks and companies, including the state power distributor, were hit by a cyber attack that disrupted some operations, the Ukrainian central bank said.

Ukrainian International Airport

Yevhen Dykhne, director of the capital’s Boryspil Airport, said it had been hit. “In connection with the irregular situation, some flight delays are possible,” Dykhne said in a post on Facebook.

Saint Gobain

French construction materials company Saint Gobain said it had been a victim of a cyber attack, and it had isolated its computer systems to protect data.

Deutsche Post

German postal and logistics company Deutsche Post said systems of its Express division in the Ukraine have in part been affected by a cyber attack.

Metro

Germany’s Metro said its wholesale stores in the Ukraine had been hit by a cyber attack and the retailer was assessing the impact.

Mondelez International

Food company Mondelez International said employees in different regions were experiencing technical problems but it was unclear whether this was due to a cyber attack.

Evraz

Russian steelmaker Evraz said its information systems had been hit by a cyber attack but its output was not affected.

Norway

A ransomware cyber attack is taking place in Norway and is affecting an unnamed international company, says the Nordic country’s national security authority.

Additional reporting by Reuters

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