Heathrow flights delayed and cancelled as cyber-attack hits European airports

Attack raises questions over security as Brussels and Berlin airports' check-in and boarding systems also affected

Flights have been delayed and cancelled at three leading European airports - including London's largest, Heathrow - after the company behind the software used for check-in and boarding said it was hit by a cyber-attack.

Airports in Brussels and Berlin are also experiencing delays and disruption as a result of the problem affecting Collins Aerospace, which works for several airlines at airports across the world.