CrowdStrike: How an IT outage caused worldwide havoc

Flights were cancelled, trains delayed, shop tills stopped working and TV stations went off the air. All because of a faulty upgrade to a cyber security software system which triggered a global meltdown.

The boss of Crowdstrike, the firm behind the system, took to social media to apologise, and insisted "a fix is being put in place".

But it was also a wake up call - revealing just how quickly the ripple effect from a single glitch could affect industries across the world.

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