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EN
Danish PM calls drone flights 'most serious attack' on country's infrastructure
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The Local Denmark
Frederiksen told Danish broadcaster DR she could "not rule out" that Russia was behind the drone activity.
Danish intelligence said the Scandinavian country was facing a "high threat of sabotage".
"It could very well be something initiated from a ship," he told Danish broadcaster DR.
The Copenhagen airport is located on the coast of the Øresund Strait, between Sweden and Denmark.
A total of 14 flights were diverted from Oslo airport, she said.
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