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

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

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