COPENHAGEN (Reuters) -Danish police said on Tuesday that drones that shut the country's main airport on Monday appeared to have been flown by "a capable operator" seeking to demonstrate certain abilities,

Danish police have said that the drones which caused the shutdown of the country's main airport were likely controlled by a "capable operator". The drones came from different directions, turned their lights on and off and disappeared after a few hours.

All flights in and out of Denmark's Copenhagen Airport were held up for hours after police reported two or three large drones spotted in the vicinity.

Drones have flown over four Danish airports overnight, the latest instance of unexplained drone activity that has raised concerns about security in northern Europe amid growing Russian aggression

Sightings of two or three large drones near Copenhagen airport late on Monday halted all take-offs and landings for nearly four hours, as Denmark linked them to a series of suspected Russian drone incursions and other disruptions across Europe.