About 3,000 Brussels Airlines passengers were affected by the disruption, and the carrier said it faced “considerable costs” from cancelling or diverting dozens of flights.
German Defence Minister Boris Pistorius and the Belgian security services have said they suspect Russia, but Belgian Defence Minister Theo Francken has previously admitted there is no accompanying evidence.
“At first, drones flying over our military bases were seen as our problem,” Francken said earlier this week.
“Now it has become a serious threat affecting civilian infrastructure across multiple European countries.”
