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Europol also warned a “complex international investigation” was required “to identify the culprits”.
Europol said its cyber-crime team, EC3, was working closely with similar teams in the affected countries to “mitigate the threat and assist victims”.
In the UK, the head of the cyber security agency said experts were “working around the clock” to restore the systems of some 45 NHS organisations in England and Scotland that were hit by the attack.
Massive ‘Ransomeware’ Cyber Attack Worldwide