Heathrow warns of delays as cyber attack disrupts European airports

European airports - including London's Heathrow - are warning of delays after a "technical issue" affected check-in and boarding systems.

Brussels Airport said a cyber attack was causing the disruption, as it confirmed 10 flights had been cancelled and 17 flights were experiencing delays of more than one hour.

"It is still too early to say when the problem will be resolved," it said.

Berlin Airport is also among those experiencing delays.

The attack targeted a business providing check-in and boarding systems for several airlines around the world.

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With automated systems down, staff are having to conduct manual check-in and boarding procedures, according to Brussels Airport.

"This has a large impact on the flight schedule and will unfortunately cause delays and cancellations of flights," it said in a statement on its website.

Heathrow warned of delays caused by "a technical issue" at a third-party supplier and told passengers to check the status of their flight before travelling to the airport.

It named Collins Aerospace as the company experiencing the issue, saying it may cause delays for departing passengers.

RTX, the owner of Collins Aerospace, said it is aware of cyber-related disruption to its software.

"We are actively working to resolve the issue and restore full functionality to our customers as quickly as possible," RTX said.

"The impact is limited to electronic customer check-in and baggage drop and can be mitigated with manual check-in operations."

The company said the issue with its MUSE software was identified after major European flight hubs flagged delays due to a cyber attack.