COPENHAGEN, Denmark (AP) — Drones flew over four Danish airports overnight Wednesday into Thursday, the latest instance of unexplained drone activity that has raised concerns about security in northern Europe amid growing Russian aggression.

Defense Minister Troels Lund Poulsen called the incidents a “hybrid attack” because the flights all occurred within roughly the same timeframe. It was not immediately clear who was behind the incidents, but Lund Poulsen said that it appeared a “professional actor” was behind the “systematic” flights.

While careful not to directly accuse a specific country, Danish intelligence officials reiterated that they estimate the risk of Russian espionage and sabotage in Denmark as high. “We have seen this in other parts of Europe, and we must also expect to se

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