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Ukraine hit by major cyber-attack Many firms hit by major cyber-attacks
(35 minutes later)
Kiev's main airport appears to have been among the victims of a major cyber-attack in Ukraine. Kiev's main airport appears to have been among the victims of a spate of cyber-attacks.
Operator Boryspil said that it could cause flights to be delayed. Boryspil's operator said that it could cause flights to be delayed.
Shipping company AP Moller-Maersk, Russian oil producer Rosneft and a number of Ukraine's commercial banks also said they had been hit. Others reporting problems include the Ukrainian central bank, the state power distributor Ukrenergo, the aircraft manufacturer Antonov, and two postal services.
The unknown virus also appeared to be affecting some private companies, retailers and government systems. Other reports suggest that the problem is not limited to Ukraine.
More to follow Russian oil producer Rosneft and Danish shipping company Maersk also say they face disruption, including its offices in the UK and Ireland.
"We can confirm that Maersk IT systems are down across multiple sites and business units due to a cyber-attack," the Copenhagen-headquartered firm said via Twitter.
"We continue to assess the situation. The safety of our employees, our operations and customers' business is our top priority."
Spanish media reports that the offices of large multinationals such as food giant Mondelez and legal firm DLA Piper have suffered attacks.
Some are speculating that it is a similar ransomware assault to the massive global Wannacry virus, which hit in May.
Ukraine seems to have been particularly badly hit.
Reports suggest that the Kiev metro system has stopped accepting payment cards while several chains of petrol stations have suspended operations.
Ukraine's deputy prime minister has tweeted a picture appearing to show government systems have been affected.
His caption reads: "Ta-daaa! Network is down at the Cabinet of Minister's secretariat."