Thousands of computers in China and Japan hit by WannaCry virus

Putin says Russia had 'nothing to do' with global ransomware outbreak

Microsoft attacks US government over developing 'EternalBlue' exploit that led to hack

New strains of virus reported but having little effect

Jeremy Hunt says there has been no second wave of attacks

Latest evidence suggests "phishing" emails are unlikely to have caused the global cyber attack that wreaked havoc at dozens of NHS trusts and hit hundreds of thousands of computers in 150 countries.

Security experts have disputed claims that the virus was spread through suspicious emails, saying that computers were vulnerable to the bug regardless of how vigilant users were. Experts said that unless IT departments patched the virus and backed up their files they could be hit by the attacks.

Affected NHS trusts were criticised for not adding the patch despite warnings from NHS Digital a month ago that they were vulnerable to a possible attack.

Vladimir Putin has blamed the US for the global cyber attack that has crippled computer systems around the world since Friday.

Putin said Russia had "nothing to do" with the attack and blamed the US for creating the hacking software that affects Microsoft computers.