The boss of cyber-security firm Crowdstrike has admitted it could be some time before all systems are back up and running after an update from the company triggered a global IT outage.
Experts are warning that it could take days for big organisations to get back to normal.
They say although there is now a software fix for the issue, the manual process required will take a huge amount of work.
The global outage has led to almost 1,400 flights being cancelled, while banking, healthcare and shops have all been affected.
The issue was caused when an update from Crowdstrike caused Microsoft systems to blue screen and crash.
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