Drones have been seen near military facilities including Denmark’s largest, following a series of incidents that caused air disruption earlier this week.

The devices were observed above Karup airbase, among others, forcing it to briefly close its airspace to commercial traffic. Possible sightings were also reported in Germany, Norway and Lithuania.

It is the latest in a string of suspicious drone activity in Denmark, raising concerns about the nation’s vulnerability to aerial attack and sparking fears of potential Russian involvement.

Danish authorities said Thursday’s incursions appeared to be a “hybrid attack”, but cautioned that they had no evidence to suggest Moscow was behind it.

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There are suspicions that the wave of drone incursions may be part of a Russian strategy of indirect aggression towards Nato states supporting Ukraine in its war with Russia - though this connection has not been proven.

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