What went wrong with the electronic passport gates at UK airports?

Passengers waited more than three hours for passport checks on Tuesday, as the country’s 270 e-gates malfunctioned

Thousands of passengers were left waiting in queues for more than three hours at airports, on Tuesday evening, after a nationwide failure of the electronic passport gate technology system.

Nearly all major British airports were affected as the country’s 270 e-gates, the automated facial recognition systems at the border, were closed for more than four hours.

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