London: Another major cyber-attack is imminent after Friday's global hit that infected more than 125,000 computer systems and could come on Monday, a security researcher warned on Sunday.
The virus, which took control of users' files, spread to 100 countries, including Spain, France and Russia.
In England, 48 National Health Service (NHS) trusts fell victim, as did 13 NHS bodies in Scotland.
Some hospitals were forced to cancel procedures and appointments, as ambulances were directed to neighbouring hospitals free from the computer virus.
After taking computers over, the virus displayed messages demanding a payment of $300 in virtual currency Bitcoin to unlock files and return them to the user.
"We have stopped this one, but there will be another one coming and it will not be stoppable by us," the 22-year-old told the BBC on Sunday.
"So there's a good chance they are going to do it... maybe not this weekend, but quite likely on Monday morning."
He also warned hackers could upgrade the virus to remove the "kill switch" that helped to stop it.
"Version 1 of WannaCrypt was stoppable but version 2.0 will likely remove the flaw. You're only safe if you patch as soon as possible," he tweeted.
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