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A disruption to check-in and boarding systems at airports in Berlin, Brussels and London threatened to snarl travel.

By John Yoon

Flight delays were expected in at least three European travel hubs on Saturday after technical problems with check-in systems. The cause was a cyberattack, according to one of the airports.

Berlin-Brandenburg Airport, Brussels Airport and Heathrow Airport in London said that the technical issue was affecting departing passengers and was likely to cause delays.