The airport in the northern Danish city of Aalborg was closed on Wednesday, after drones were observed over its airspace, an airport spokesperson said.

"Drones have been spotted near Aalborg Airport and the airspace has been closed," Police said on X. "The police are on site and investigating further."

What do we know so far?

Eurocontrol, the agency that oversees European air traffic control, said arrivals and departures at Aalborg airport would be at a "zero rate" until 6 a.m. local time (0400 GMT/UTC) on Thursday.

No information was provided on how many drones had been observed.

The closure of the small airport affected four flights from Scandinavian Airlines (SAS), Norwegian airlines and the Dutch carrier KLM.

Copenhagen Airport earlier shut over drone sightings

The incident comes just two days after Denmark's main airport in Copenhagen was shut over drone sightings, which are still under investigation.

Prime Minister Mette Frederiksen described the incident as "the most serious attack on Danish critical infrastructure to date," which led to the cancellation of some 100 flights and affected tens of thousands of passengers.

European Commission President Ursula von der Leyen said on Tuesday that the drones were part of a "pattern of persistent contestation at our borders."

Operations at Copenhagen Airport have since returned to normal.

Aalborg Airport is much smaller than the capital's airport.

Drones were also seen at the airports in Esbjerg, Sonderborg and at the Skrydstrup airbase, police said.

Norwegian authorities also shut the airspace at Oslo airport for three hours on Monday evening after a drone was spotted.
 

Edited by: John Silk