Companies in Asia have reported a number of cases of computer disruption caused by the WannaCry ransomware attack.
Europol, the pan-European security service expects the threat from such cyber attacks to escalate and warns the number of victims will grow as people return to work after the weekend.
Microsoft head, Brad Smith, has criticised the manner in which governments store details about security weaknesses in computer systems.
Companies have employed cyber security experts to work over the weekend to stall further infection.
Even though the spread of the virus has slowed further attacks are expected as the original hackers, or others can easily change the virus code to make it difficult to guard against.
Some of Europe’s largest companies were hit on Friday including Renault, Deutsche Bahn, FedEX and the Russian interior ministry.
In the UK 61 National Health Service trusts were infected, which led to chaos and cancellations.