Danish Airport and Military Base Drone Incursions

September 2025. Europe was already on edge. Earlier that month, Russian drones had crossed into Poland. Then the lights appeared over Denmark.

Monday, 22 September. Evening at Copenhagen Airport, Kastrup. The airport closed its airspace "due to two to three unidentified drones." Police spoke of "three or four big drones." They came from different directions. They turned their lights on and off. After several hours, they disappeared. The airport stayed shut for about four hours. At least 109 flights were cancelled and 51 diverted.

Chief Superintendent Jens Jespersen was blunt. "The number, size, flight patterns, time over the airport. All this together… indicates that it is a capable actor. Which capable actor, I do not know." The operators might have been many kilometres away. Perhaps on a ship. Shooting the drones down was too risky, he said. The airport was full of passengers, planes were on the runways and fuel depots were nearby.

Wednesday, 24 September. 21:44. Aalborg Airport. North Jutland police reported "more than one drone" flying "with lights on." Chief Police Inspector Jesper Bøjgaard Madsen said: "It was not possible to take down the drones, which flew over a very large area over a couple of hours." The same night brought reports near Esbjerg and Sønderborg airports and at Skrydstrup Air Base, home to F-16 and F-35 fighters. Aalborg closed again the next night. On Friday, drones were reported "both inside and outside" Karup Air Base, Denmark's largest military installation.

Prime Minister Mette Frederiksen called it "the most serious attack on Danish critical infrastructure to date." Defence Minister Troels Lund Poulsen spoke of "a hybrid attack using different types of drones." Justice Minister Peter Hummelgaard later compared the events to 9/11. Police went to heightened readiness for the first time since the 2015 Copenhagen attacks. Reservists were mobilised. The Kremlin called the allegations "unfounded." Vladimir Putin joked, "I won't do it anymore," and compared the sightings to UFO reports.

The evidence proved thin. One radar picked up an object moving at about 100 km/h over the Øresund. Its maker, Robin Radar, later said the airport's bird radar "wasn't designed to detect drones." Dronewatch reported that air traffic controllers saw no drones at all. No wreckage was found. No drone was intercepted, although released Defence Ministry documents confirm that attempts were made to shoot some down. Until 30 September, the military filed every report as a "drone incident," whether or not anyone had confirmed it. "Reports were of varying quality."

25 June 2026. Chief Police Inspector Søren Thomassen closed the Copenhagen case. "Overall, our conclusion today is that we cannot demonstrate that there was drone activity in and around the airport." Drones could not be ruled out either. There was, he said, "unexplained activity in the airspace."

Within days, sceptics had a candidate. Copenhagen Airtaxi said its Socata TB-20 Trinidad, registration OY-CDT, was flying training circuits in the area. Tracking data showed it passing over the main runway twice, below 400 ft. The Metabunk forum matched the viral Kastrup video to this aircraft. Analysts including Mick West argued that reports of a "large stationary drone" matched bright stars such as Betelgeuse. Other police districts traced many reports to planes, helicopters, satellites, stars or birds. Yet no one has shown that any sighting was deliberately faked.

The DR documentary Droner over Danmark asked whether the crisis was driven by "misinterpretations and collective panic." Officials still say some of the activity is unexplained. What flew over Denmark that September is still an open question.