Berlin airport is battling to restore its check-in and baggage handling systems after a cyberattack at the weekend, with further delays and cancellations possible on Wednesday, the airport operator said in a statement.
Berlin is one of several airports across Europe impacted by the disruptions, attributed to a ransomware attack on software provider Collins Aerospace, which have affected dozens of flights and thousands of passengers since Friday.
It may take several more days before the German capital's airport has functional and secure software again, with staff working flat out to process passengers manually in the meantime, the BER operator said in a statement.
The software provider "has called in other experts and is working urgently to find a solution," it added.
Passengers should be prepared for long delays, and the airport encouraged people to check with their airlines in advance whether their flight was still planned.
Collins Aerospace said on Monday that it was working with the affected airports, which also include Brussels and London Heathrow, Europe's busiest.
Berlin airport was particularly busy after a marathon took place in the city over the weekend, with many runners struggling to return home.
US military targets IS in Syria strikes
Israeli fire kills three people in Gaza, tension rises
Tens of thousands protest in Minneapolis over fatal ICE shooting
One dead in Australian bush fires
Trump says US needs to own Greenland to deter Russia, China
