Drones were observed over the Aalborg Airport on Wednesday evening and during the night to Thursday, and the airspace over the airport was closed.

Denmark said on Thursday that drone incursions that briefly shut two of its airports and affected military installations overnight were hybrid attacks intended to spread fear, but said it did not know who was behind them.

The incidents are just the latest in a series of drone incursions – including two days ago in Denmark – over the past few weeks that have exposed the vulnerability of European airspace and the challenges governments face in countering them.

Poland shot down suspected Russian drones in its airspace on September 10. Danish authorities said on Thursday they decided not to take down any of the drones in its airspace for safety r

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