Drones flew over multiple airports across Denmark and caused one of them to close for hours, police said Thursday after a similar incident this week prompted Copenhagen airport to shut.

The latest incidents in Danish skies follow similar events in Poland and Romania and the violation by Russian fighter jets of Estonia’s airspace, which have raised tensions in light of Russia’s ongoing invasion of Ukraine.

Drones were spotted at Denmark’s airports in Aalborg, Esbjerg, Sonderborg and at the Skrydstrup air base before leaving on their own, police said.

Aalborg airport, located in northern Denmark and one of the country’s biggest after Copenhagen, was shut down before reopening several hours later.

“It was not possible to take down the drones, which flew over a very large area over a coupl

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