The NHS is bracing for a weekend of chaos after a cyberattack forced hospitals to close wards, turn away patients and delay treatment across the country.
At least 30 health service organisations in England and Scotland have been affected by thehack attack, while others have shut down servers as a precautionary measure to avoid contagion.
Across the world, at least 74 countries have been targeted by the attack that locked up computer and held users' files for ransom, with Russia appearing to be hardest hit.
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An alleged hacker unconnected to the incident told Sky News the attack could spread to nearly every country in the world.
"I'm sad to say that this is probably only just beginning; administrators are in for a very difficult weekend," Lauri Love said.
"We should expect to see this in almost every country in the world.
"If you've been infected, not only have your files been encrypted and you're being held to ransom, but your machine is being used as a zombie to attempt to affect other machines on the internet.
"This means it will tend to grow at an exponential rate until it runs out of vulnerable hosts to infect."
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