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What has caused a worldwide IT outage?

A massive tech failure has caused travel chaos around the world, with banking and healthcare services also badly hit.

Flights have been grounded because of the IT outage - a flaw which left many computers displaying blue error screens.

Some people are calling the ‘biggest internet outage ever’ – but what is behind the outage?

The ´óÏó´«Ã½â€™s Esther Kahumbi explains.

Video edited by Jenna Abaakouk

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