Massive cyberattack hits Europe with widespread ransom demands    

The hack hit Ukraine hardest Tuesday, but it also affected computers from Russia to Britain. 

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Global ransomware attack causes chaos - BBC News
Banks, retailers, energy firms and Kiev airport say they have been targeted by malware attacks.

Global cyber attack hits US pharmaceutical giant Merck
One of the largest pharmaceutical companies in the world has been hit by a global ransomware attack, the company says. The so-called "Petya" cyberattack, which started in Ukraine, has spread across the globe over the last 24 hours. The attack hit major companies in countries like Spain, India, and the UK, and now appears to have reached the US.

'Powerful' cyberattack on Ukraine goes global
Chernobyl's radiation monitoring system is among the networks worldwide targeted by a crippling ransomware virus.

Firms across world hit by huge 'Peyta' cyber-attack
A major cyber attack is spreading across the world, with a number of firms reporting they have been hit. British advertising agency WPP, based in London, is among those hit, and said its computer networks in several locations have been targeted. The attack initially hit Ukraine on Tuesday morning – the biggest cyber attack in its history – but firms in a number of other countries are also now reporting being affected.

Petya cyber attack: Ransomware spreads across Europe with firms in Ukraine, Britain and Spain shut down
Major firms, airports and government departments in Ukraine have been struck by a massive cyber attack which began to spread across Europe on Tuesday afternoon.

Major global companies hit by 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.