Denmark’s Aalborg airport, serving both civilian and military flights, was shut on Thursday after drone sightings, just two days after similar incidents disrupted operations at Copenhagen airport, heightening security concerns across Europe.

Danish national police said the drones followed a similar pattern to the ones that had halted flights at Copenhagen airport for four hours a few days earlier. Local police later said the drones had left the Aalborg area after about three hours.

Denmark said on Tuesday the incident at Copenhagen airport was the most serious attack yet on its critical infrastructure and linked it to a series of suspected Russian drone incursions and other disruptions across Europe.

The closure of Aalborg airport also affected Denmark’s armed forces because it is u

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