COPENHAGEN (Reuters) -Denmark’s Aalborg airport is currently closed due to drones in its airspace, a spokesperson for the airport said late on Wednesday, two days after the country’s main Copenhagen airport was shut over drone sightings that rattled European aviation.

Denmark said on Tuesday that the drones that halted flights at Copenhagen airport for four hours were the most serious attack yet on its critical infrastructure and linked them to a series of suspected Russian drone incursions and other disruptions across Europe.

Authorities in Norway also shut the airspace at Oslo airport for three hours on Monday evening after a drone was seen.

Norwegian and Danish authorities are in close contact over the Copenhagen and Oslo incidents but their investigation has not yet established a co

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