Drone attacks leave Denmark exposed - and searching for response

In an era of hybrid warfare, there is a sense of embarrassment that Denmark's critical infrastructure has become vulnerable.

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In an era of hybrid warfare, there is a sense of embarrassment in Denmark - a founding member of the North Atlantic Treaty Organization (Nato) alliance - that its critical infrastructure has become so vulnerable.

Aalborg and Billund airports had to close on Wednesday night, while drones were spotted at Esbjerg, Sonderborg and Skrydstrup. Aalborg also serves as a military base and Skrydstrup is home to some of the air force's F-35 and F-16 war planes. Drones were also seen over the Jutland Dragoon regiment at Holstebro.

There have since been reports of police investigating drone activities around Denmark's oil and gas platforms in the North Sea, and near the central port of Korsor.

Aalborg airport briefly closed again on Thursday night following another suspected drone sighting, police and national media said on Friday.