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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