Global companies hit by major cyber attacks

Danish shipping and oil firm A.P. Moller-Maersk has reported its computer systems crashed as a result of a cyber attack on Tuesday. The company called it a global issue.

"We can confirm the breakdown is caused by a cyber attack," a spokeswoman said.

The company posted on Twitter, "We can confirm that Maersk IT systems are down across multiple sites and business units. We are currently assessing the situation."

Maersk added the source of the outage is not known, but the problem could be global.

Also on Tuesday, Russia's largest oil producer Rosneft said a large-scale cyber attack had hit its servers, but oil production was unaffected.

International steel and mining company EVRAZ also said it had been a target of a hacker attack.

"The information system has undergone an attack, the main production continues to operate, there...