Drones spotted in Copenhagen and Oslo on the evening of the 22nd of September caused closure of the main airports, and it follow a cyberattacks on several European airports last weekend, the BBC reports.
Danish police have not been able to determine the exact number of drones, nor do they know where they came from or where they are now. Copenhagen airport reopened at around 1:30 local time, with flights suspended for four hours. Oslo airport also reported a four-hour airspace closure.
The Danes said they would implement a series of measures during the investigation, but did not specify what they would be. Asked whether the drones could be linked to Russia, a police spokesman said they could neither confirm nor deny it.
Meanwhile, Ukrainian President Volodymyr Zelensky later referred to the incident on social media as a violation of NATO airspace by Russia.
Neither the European Union nor NATO representatives have commented publicly on the incident.
Danish police have said they will hold a press conference on the morning of the 23rd of September.
Flight tracking website Flightradar24 reported that at least 35 flights were diverted while Copenhagen Airport was closed.
The drones were spotted over Oslo Airport around midnight, and the airport was closed until around 4:30 a.m. local time.
Danish police plan to work with Norwegian authorities to determine whether the two drone sightings are connected.
Read also: EU cybersecurity experts: Ransomware used at airports
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