The airport in Olberg, Denmark, had to close last night, the alert was again due to drones, and official Copenhagen states that it was the target of a "hybrid attack" of unknown origin, for the second time since the beginning of the week.
The airspace above Aalborg Airport in northern Denmark was closed last night due to a drone alert and reopened at around 00:35 tonight, Danish police said.
Due to the airport closure, a KLM flight from Amsterdam was turned back, and a Scandinavian Airlines flight from Copenhagen was canceled, according to online airline flight tracking sites.
So far, the authorities have not officially reported the presence of drones.
The Earth is on alert after multiple incidents in its skies since Monday.
In Denmark, drones were spotted on the night of Wednesday to Thursday above Olberg Airport in the north, which was closed for several hours as a result, Esjberg in the west, Sonderborg in the south and above the Skridstrup military base in the south as well, according to police.
On Monday, unidentified drones flew over the airport in Copenhagen and Oslo, in neighboring Norway, blocking air traffic for several hours.
Yesterday, Danish Prime Minister Mette Fredriksen said these were "hybrid attacks" and warned that there could be more drone overflights.
Danish authorities have not yet identified where these aircraft are coming from.
But Fredriksen said that "there is mainly one country that poses a threat to Europe's security, and that is Russia.
Danish Defense Minister Troels Lund Poulsen said yesterday that the flights were the work of a "professional actor" and posed a "systematic threat."
Norway announced yesterday that it had arrested a foreign man who was flying drones near Oslo International Airport. The device was seized.
These incidents follow the incursions of allegedly Russian drones into Poland and Romania in mid-September and the incursion of Russian fighter jets into Estonian airspace on September 19, but Danish authorities have not yet established a connection between the incidents.
Russia has "firmly" denied involvement in the overflights, and the Russian embassy in Copenhagen has condemned the "organized provocation."
EU countries are due to hold a video conference on Thursday to discuss European Commission President Ursula von der Leyen's proposal to establish a "wall" of drone defense.
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