Denmark says a "professional actor" was behind drone flights over multiple airports this week in a "hybrid attack" designed to create fear, adding it would acquire new capabilities to detect and down drones.

Police said on Thursday, local time, that drones flew over several airports across the country and caused one of them to close for hours, after a similar incident early this week prompted Copenhagen airport to shut down.

"There can be no doubt that everything points to this being the work of a professional actor when we are talking about such a systematic operation in so many locations at virtually the same time," Defence Minister Troels Lund Poulsen told a press conference.

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