Denmark's Aalborg airport in the country's north has been closed after unauthorised drones were seen in its airspace, according to local authorities. Three other smaller airports in the country's southern region - Esbjerg, Sønderborg, and Skrydstrup - also reported drone activity but were not closed.

The incident comes after the country's Copenhagen airport was forced to shut earlier this week due to a drone incursion, which the prime minister described as 'the most severe attack on Danish infrastructure so far.' Police noted that the devices could be seen from the ground and indicated ongoing investigations to uncover who was controlling them and their motives.

At least three flights have been diverted from Aalborg, affecting the Danish Armed Forces as the airport also serves as a military base. Chief Inspector Jesper Bøjgaard Madsen stated that while they couldn't comment on the purpose behind the drones, they would act to take them down if possible. Despite monitoring the situation closely, police affirmed that no immediate danger was posed to passengers or residents.

This series of drone sightings has raised national security concerns, particularly amid allegations of potential Russian involvement, although these claims have been dismissed by Russian authorities as unfounded. The Danish Prime Minister underscored the significant risks posed to infrastructure and public safety, reflecting a broader alertness across Europe regarding airspace incursions.