Denmark has contacted NATO over a drone attack at one of the country's airports.

Inbound flights to Denmark's Aalborg Airport were diverted last night after the base - also used by the military - shut down due to drones in its airspace.

"Drones have been observed near Aalborg airport and the airspace is closed. The police are present and investigating further," police said on social media last night. The drones flew with their lights on, officers confirmed.

Denmark has contacted NATO over the incursion - but has not confirmed whether it has triggered Article 4 - which a member state can raise when it feels its territorial sovereignty has been threatened. The clause is not to be confused with Article 5, which is how an attack on one state is considered an attack against the alliance.

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