A new version of the “WannaCry” virus that hit the NHS has been discovered – and it is infecting 3,600 computers every hour, a tech security firm has revealed.

It is believed that over 40,000 machines may have been infected by the second release of the malware, despite the efforts of security companies.

The original cyber attack began spreading worldwide on Friday and by yesterday it had infected 300,000 computers in more than 150 countries.

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