COPENHAGEN (AFP)
Large drones that flew over Copenhagen airport for hours and caused it to shut down constituted the "most serious attack on Danish critical infrastructure" to date, Prime Minister Mette Frederiksen said Tuesday.
Airports in Copenhagen and Oslo reopened early Tuesday, hours after unidentified drones in their airspace caused dozens of flights to be diverted or cancelled, disrupting travel for thousands of passengers.
"This is part of the development we have recently observed with other drone attacks, airspace violations, and cyberattacks targeting European airports," Frederiksen said in a statement sent to AFP.
Copenhagen police inspector Jens Jespersen told reporters "several large drones" flew over the Copenhagen airport for more than three hours on Monday evening.
Airport officials said air traffic had resumed early Tuesday but 20,000 passengers were affected by flight diversions and cancellations.
Copenhagen police said they were cooperating with colleagues in Oslo after drone sightings also caused the airport in the Norwegian capital to close for several hours.
"We had two different drone sightings," Oslo airport spokeswoman Monica Fasting told AFP, adding that 14 flights were diverted.