Copenhagen Airport halted all traffic after unidentified drones were 'spotted nearby', stopping all planes from landing or taking off for around four hours.
All flights were suspended as of 8.26pm local time due to drone reports. The airport reopened at around 12.30am but delays and cancellations are expected to continue.
Between two and three 'large' drones were sighted in the area, Copenhagen police spokesperson Henrik Stormer said, and the airport revealed the drones remained present in the area for several hours afterwards.
'They are still flying back and forth, coming and going,' duty officer Anette Ostenfeldt said at 10:45pm (20:45 GMT), adding that police are still at the airport investigating.
She could not say if the drones were military or civilian devices.
