Denmark announced on Saturday further episodes of unexplained drone activity, this time occurring over military sites, including its largest base, following recent disruptions at airports that halted flights. The NATO nation is still determining its course of action.

Denmark’s Armed Forces reported that more drones were observed overnight, according to Reuters. 

“The Danish Defense confirms drones were noticed at multiple defense locations last night. Various resources were deployed,” a spokesperson stated to the media.

Police said drones were spotted near the Karup air base in western Denmark, Reuters reported, citing Ritzau News agency.

Earlier in the week, a parallel drone event affected Copenhagen Airport. Unlike the situation in Aalborg, there was speculation that Russia might be responsible for the act.

Danish Prime Minister Mette Frederiksen remarked that it was “the most severe attack on Denmark’s critical infrastructure thus far,” as per reports. She mentioned the nation was “keeping all possibilities open regarding the perpetrator,” Reuters noted.

NATO Secretary-General Mark Rutte mentioned on Friday that he had a discussion with Frederiksen concerning the drones, emphasizing that the alliance treats these incidents “with utmost seriousness.”

“NATO Allies and Denmark are collaborating on how to safeguard and secure our vital infrastructure,” Rutte expressed in a post on X.

Danish Prime Minister Mette Frederiksen speaks to the media following talks with German Chancellor Olaf Scholz at the Chancellery on Jan. 28, 2025, in Berlin. (Maja Hitij/Getty Images)

While some believed the country was considering triggering NATO’s Article 4 to convene allied countries over the drone incidents, Danish Foreign Minister Lars Lokke Rasmussen said the country had “no reason to do so,” according to Reuters. Rasmussen said that after Article 4 was recently triggered due to aerial disturbances in Poland and Estonia, Denmark did not feel a need to do the same, Reuters reported.

Despite neither triggering a NATO response nor shooting down the drones, Denmark is still mulling a possible response to the sightings.