Governments and computer experts girded Monday for a possible worsening of the global cyberattack that has hit more than 150 countries, as Microsoft warned against stockpiling vulnerabilities like the one at the heart of the crisis.
The "Wannacry" virus locks users out of their computers and demands hundreds of dollars from victims hoping to regain control of their documents and data.
Europol executive director Rob Wainwright told Britain's ITV television on Sunday that the attack had been "unprecedented".
Britain's National Health Service, one of the largest state-run systems in the world, was also one of the most significant victims of the attack, with almost 60 of the U.K. "Trusts", or regional hospital networks, affected.
"We are continuing to experience some technical issues at the moment".
Ms Sturgeon said she was not aware of any ransoms being paid over the cyber attack but said that will be part of the police investigation.
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Meanwhile health authorities are racing to upgrade security software amid fears hackers could exploit the same vulnerability with a new virus.
"We're not talking about a government organisation or a hospital or anything like that".
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In Japan, a spokesman for Hitachi said the conglomerate discovered problems on Monday morning and its computer networks were "unstable".
At least one Australian business has fallen victim to the ransomware attack and there are investigations into two other reports, the federal government says. But some experts have argued this attack could have been vastly mitigated if the NSA told Microsoft sooner.
Putin was referring to a weekend blog post by Microsoft president Brad Smith stating that the US National Security Agency had developed the code being used in the attack.
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The Health Secretary Jeremy Hunt was warned about the failure to update cyber security on NHS IT systems a year ago.
Labour's shadow health secretary, Jonathan Ashworth, in a letter to Health Secretary Jeremy Hunt, said concerns were repeatedly flagged about outdated computer systems.
Some hospitals were forced to cancel procedures and appointments, as ambulances were directed to neighboring hospitals free from the computer virus.
"The governments of the world should treat this attack as a wake-up call", Smith wrote while also noting how "cybersecurity has become a shared responsibility between tech companies and customers".
Other organisations targeted include Germany's rail network Deutsche Bahn, Spanish telecommunications operator Telefonica, French carmaker Renault, US logistics giant FedEx and Russia's Interior Ministry.
"Staff are working hard to ensure that the small number of organisations still affected return to normal shortly".
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Mr Hunt has come under fire for failing to appear in public since the attack, which hit 47 trusts in England and 13 Scottish health boards.