Banks, government IT systems and energy firms around the world have all been targeted by a powerful cyber attack
A Danish shipping company called Maersk which has offices in Ireland and the UK took to Twitter to state it's one of the victims
While details are continuing to emerge, experts say it's thought to be a ransomware attack, similar to the WannaCry attack that occurred earlier this year.
Computers running older versions of Windows are most vulnerable to attack.
Cyber security expert Urban Schrott from Eset Ireland says having anti-virus patches up to date is also essential.
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