Police stand guard after traffic had been closed at the Copenhagen Airport due to drone reports on Sept. 22.

Denmark ordered a ban on Sunday on civil drone flights, after drones were observed at several military facilities overnight , following a week in which drone sorties caused the temporary closures of several Danish airports.

The Danish military said in a statement it had deployed “several capacities” in response to the overnight sightings at bases, declining further comment on the nature of its response.

Drone sorties earlier this week forced Denmark to shut airports, including a nearly four-hour closure of Copenhagen Airport on Monday.

Denmark has called the drones part of a “hybrid attack.” It has stopped short of saying definitively who it believes is responsible, but Prim

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