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 attacks 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.

Friday's incident took place around 20:15 local time (18:15 GMT) and lasted several hours, with officials stating that police could not comment on where the drones had come from as they had not shot them down. The Danish Defence Ministry confirmed that drones were sighted near multiple military installations overnight, but did not specify which ones.

These incursions come just days after drones over Danish airports, which housed military facilities, forced closures of airspace. On Monday, Copenhagen airport was shut down for several hours due to drones, with similar incidents affecting other airports in the region.

Authorities suspect that these drone incursions might form part of a strategy by Russia to indirectly threaten NATO states supporting Ukraine in its ongoing war with Russia. The Russian embassy in Copenhagen denied any involvement, calling accusations 'absurd', as Danish officials described the attacks as executed by a 'professional actor'. Hybrid attacks incorporate non-military tactics to disrupt national institutions, and this incident has left Denmark on high alert as it navigates these emerging threats to its airspace.