Drones have disrupted activity at the second Danish airport in a week, after Aalborg airport in the north of the country was temporarily closed when drones were seen in its airspace.

Three other smaller airports in the southern region - Esbjerg, Sønderborg and Skrydstrup - also reported drone activity, but were not closed.

The incidents come after Copenhagen airport was forced to close earlier this week due to a drone incursion, which the prime minister described as “the most severe attack on Danish infrastructure so far”.

Europe has been on high alert after several Nato member states reported Russian incursions in their airspaces.

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