UK businesses and organisations in critical sectors have been warned to take steps to protect themselves against Chinese hackers as three China-based technology companies were accused of being linked to global cyber attacks.

The National Cyber Security Centre, which is part of GCHQ , is among security bodies from 13 countries to issue warnings that organisations in crucial sectors should “proactively hunt” for activity by Chinese hackers and patch up weaknesses.

Authorities say that the attackers behind a campaign targeting foreign governments and key services including telecoms have taken advantage of known common vulnerabilities, rather than using malware or exploiting previously undetected weaknesses.

A security advisory issued on Wednesday named three China-based tech firms that

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