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Disruption at some European airports continued for a second day on Sunday after a cyberattack targeted check-in technology company Collins Aerospace.

The U.K.’s largest airport, Heathrow, was among those affected, along with Berlin and Brussels airports.

Brussels Airport said it expected heavy disruption and flight cancellations into Sunday as a result of the cyberattack.

Collins Aerospace “provides check-in and boarding systems for several airlines across multiple airports globally,” Heathrow Airport said in a post on X Saturday.