So far there are approximately 200,000 victims.
Other victims were most likely small and medium-sized businesses.
"Emergency 999 services remain fully operational and NHS 111, the non-emergency service, is also unaffected".
Home Secretary Amber Rudd is due to chair a meeting of the Government's emergency Cobra committee on Whitehall at 5pm on Monday.
He added: "The governments of the world should treat this attack as a wake-up call". The software took control of the people's computer and files and demanded users to pay $300 (Rs 19,000 approx) in virtual currency Bitcoin to unlock the files and regaining access to their systems.More news: Deadline to register to vote in General Election 2017 just days away
Chinese state media on Monday quoted the official Cyberspace Administration of China as saying the attack is still spreading in the country, but had slowed significantly. Security firms say Russian Federation was the country that was hit the hardest. He says while it may be time consuming, update your software when it says it has an update. WannaCry seems to be built to exploit a bug found by the US National Security Agency.
A spokesman said: "Our understanding is that if that had been acted on it would have prevented (the malware attack)". That amount is expected to increase.
The NSA and White House did not immediately respond to requests for comment about the Microsoft statement, Reuters news agency reported. According to a Lakeridge spokesperson, however, the hospital's antivirus system was able to disable the ransomware. Despite its age and obsolescence, Windows XP was still used on more than 7% of PCs around the world as of April, according to NetMarketShare data charted for us by Statista.
A kill switch was accidentally discovered for the "Wannacry" virus that attempts to extort people of money in return for their data by a British cybersecurity researcher. The ease of stopping the attack suggests the hackers were new to this game. Additionally, experts warn that copycats could also try another attack.
A Windows security update was released in March, but many users were yet to run it. It locks down all the files on an infected computer. Experts are urging all organizations to update their software. Additionally, NBC News is reporting that at least two new variations of the malware have been detected that skirt over the temporary fix.