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The technology company Microsoft is with America's National Security Agency (NSA). Microsoft said the WannaCry ransomware cyber- happened because the NSA keeps lots of cyber-weapons on its . Ransomware is a type of software that blocks access to a computer until the of the computer pays money (a ) to the hackers. The NSA is America's intelligence organization. It helps to keep America's communications and information systems . It is also responsible for stopping cyber-attacks against the USA. However, say the WannaCry ransomware used computer spying tools designed by the NSA.

Microsoft president Brad Smith said governments needed to wake up to the of storing cyber-weapons that hackers can steal. He said it was as big a as someone stealing from the USA. When talking about the WannaCry attack, he said: "This attack provides another example of why the stockpiling of [these things] by governments is such a problem." The European agency Europol said WannaCry has affected 200,000 computers in 150 . In the UK, WannaCry caused many problems with the work of Britain's National Health Service. Many were cancelled. Experts warned people to back up their because a wave of could come.

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