The boss of the cybersecurity company CrowdStrike has said he is “deeply sorry” for the global IT chaos caused by a flawed software update to Microsoft’s Windows operating system which was provided by his company.

George Kurtz, the CEO of CrowdStrike, warned that it may take some time for the fix which has been implemented to work and for services to return to normal.

Millions of people around the world have been affected, after transport networks, businesses, healthcare services, TV networks and payroll systems were among those hit by the biggest global computer outage ever.

Computers failed to start-up after the flawed update and technology experts have said that every affected PC may need to be individually provided with a software fix.

Reeta Chakrabarti presents BBC News at Ten reporting by Zoe Kleinman, Emma Vardy, Katy Austin and Hugh Pym.

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