A massive tech failure that caused chaos around the world on Friday is continuing to cause disruption into the weekend.

Cyber-security firm CrowdStrike has apologised after an update to its antivirus software - which is designed to protect Microsoft Windows devices from malicious attacks – instead caused a global outage.

The outage caused thousands of flight cancellations and delays across the world, while banking, healthcare and payment systems were also affected.

But, while the software bug has been fixed, experts say the manual reboot of each affected Microsoft computer will take a huge amount of work – and may take some time.

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