Denmark says drones flown over its airports appear to be the work of a "professional actor" but there was no evidence of Russian involvement, after such activity disrupted its airspace for the second time in a week.

STOCKHOLM: Denmark said on Friday (Sep 26) it had accepted Sweden’s offer of anti-drone technology for next week’s European Union summit in Copenhagen, after a spate of mysteriou

Denmark's second-biggest airport, Billund, was briefly shut early on Friday following a report of illegal drone activity that police later identified as "a shining star in the sky," amid heightened concern over drone sightings nationwide.

"We have thoroughly investigated the area, and we have not found anything," North Jutland Police Chief Christian Tilsted said.

Several European Union leaders are participating in talks Friday afternoon to discuss a potential "drone wall" to prevent drone attacks from Russia or others.

Drones flew over four Danish airports overnight Wednesday into Thursday, the latest instance of unexplained drone activity that has raised concerns about security in northern Europe amid growing Russian aggression.

Denmark has no plans to invoke NATO's Article 4 clause on security consultations, its foreign minister said on Friday, after drone incursions shut down air traffic in various parts of the country several times this week.

Authorities reported multiple drone sightings overnight on Sept. 26 in northern Germany, which they suspect may be linked to espionage, according to German broadcaster NDR.