Unidentified drones flew close to Denmark’s main airport in what its prime minister called a “serious attack” on the country’s critical infrastructure.

A recent string of unauthorised drone activities near Norwegian and Danish airports has raised alarms and political tensions.

NATO members are on heightened alert following a wave of airspace violations by suspected Russian drones last month.

The incident comes amid heightened concerns across Europe over the presence of unauthorized drones near critical infrastructure, particularly in the wake of increased geopolitical tensions and frequent airspace violations involving Russia.

A SERIES of drone sightings in the past weeks in Norway’s skies have been wreaking havoc on the Oslo airport and left officials uneasy. At the tail end of September, illegal and unauthorised

A man, in his 50s, was flying his drone in a restricted area without it affecting air traffic. Read more at straitstimes.com. Read more at straitstimes.com.

Air traffic control staff first saw the drone at 8:17 p.m. Police arrived at the scene at around 9:50 p.m. and launched a search operation but were unable to locate the operator. “We observed the drone in the air but were unable to locate the pilot who was flying it.

Denmark's defense chief has called a series of unidentified drones being spotted near airports and military installations a "hybrid attack."

Amid rising Russian aerial incursions in Europe, drone sightings near a Swedish naval base have set off alarm bells. Drones have led to prolonged shutdowns of airports in Denmark and Norway this week.

Norway and Denmark are in close contact over separate drone incidents that halted airports in Oslo and Copenhagen, but as of yet their investigations have not yet established a connection, Norway's foreign minister said on Wednesday.