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 Â鶹ԼÅÄ’s Esther Kahumbi explains.
Video edited by Jenna Abaakouk