Taoiseach Enda Kenny says cyber attack affecting up to 100 countries is being closely monitored
Major buisnesses and corporations are being targeted by the threat which targets files and demands that a payment be made in order to unlock them
The HSE has taken measures to protect its I.T network after the NHS in the UK was hit by the ransomeware virus.
The Government says there are no reports of any Irish companies caught up in the attack so far - and the National Cyber Security Centre is in close contact with the Gardaí and HSE.
Minister for Communications Denis Naughten has described it as unprecedented.
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