Mysterious drones entered the airspace of the capitals in Denmark and Norway late Monday, forcing their respective airports to close for several hours.

Copenhagen’s airport shut down all departures and arrivals for four hours after two to three drones were spotted, affecting about 20,000 passengers. Also, Oslo’s airport halted operations for three hours after at least one drone was spotted.

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Scandinavian authorities are investigating the drone sightings to determine who was responsible. It remains unclear if the

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