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A massive cyber-attack using tools believed to have been stolen from the US National Security Agency  has struck organisations around the world.

Cyber-security firm Avast said it had seen 75,000 cases of the ransom ware- known as WannaCry and variants of that name - around the world.

There are reports of infections in 99 countries, including Russia and China.

Among the worst hit was the National Health Service in England and Scotland.

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