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British Airways suffered a computer outage causing massive delays worldwide

British Airways passengers were facing delays on Tuesday after a computer glitch hit check-in times while protesters at London City Airport forced their way onto the runway to disrupt flights.

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The airline said some flights had been cancelled due to the unspecified technical problems and passengers are being told to check-in online before they travel. Were sorry for the delays some customers are experiencing as they check-in for their flights.

Late Monday, delays occurred at airports including Atlanta, Chicago and Boston, as well as the Bahamas and Mexico.

The airline says any issues have now been resolved, but passengers are still encouraged to check-in online rather than at airport desks.

Australian financial analyst Matthew Walker said he had been waiting for more than two hours to board a flight to London from Seattle.

The incident came to light when angry passengers took to social media site to vent their frustration at the delays, with some uploading pictures of hand-written boarding passes to Twitter.

London City airport, which serves the United Kingdom capital’s business district, was meanwhile closed Tuesday morning after protesters occupied the runway.

Stricken passengers are stranded at London Gatwick Airport with British Airways yet to confirm the cause or nature of the problem.

“We don’t know the exact nature of the problem, but we’ve been rolling out an upgrade to the check-in system since last autumn”. “The check in system is now working and customers are being checked in as normal in London and overseas”. “Our colleagues are doing everything possible to check in customers for their journeys”. Travelers said that bottled water and snacks had been distributed at some airports as frustrated customers faced long lines to check in.

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The carrier, owned by International Consolidated Airlines Group icagy , had to field complaints from people stuck in long queues at airports from Toronto to San Francisco to London.

WATCH: British Airways warns of check-in delays caused by computer glitches