Authorities in Denmark said Thursday that a slew of incidents involving unidentified drones in the Scandinavian country's airspace in recent days that have shuttered airports were "hybrid attacks," but stressed they did not believe Russia was behind them.

Following fresh sightings Wednesday over the Skrydstrup air base and the closure of Aalborg Airport for the second time in three days, as well as over the southern cities of Esbjerg and Sonderborg, Defense Minister Troels Lund Poulson told a news briefing that the pattern of attacks pointed to a "professional actor."

He said the systematic nature of the operation made it what he defined as "a hybrid attack using different types of drones," but that the location they had been launched from was somewhere local.

Poulson said that while th

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