Denmark and Norway were forced to close their main airports on Monday night due to drone sightings, BBC reported.

Danish police were unable to confirm the type or the number of drones seen around Copenhagen Airport, but told reporters on Tuesday morning that they were likely flown by a "capable operator" who wanted to "show off".

Police confirmed that armed forces were activated in response to the sighting, but said there was nothing to indicate that the drones were intended to cause harm.

Operations at Copenhagen airport resumed at 00:30 local time (23:30 GMT) after flights were suspended for almost four hours following a drone sighting. Oslo airport also reopened after four hours of airspace closure, according to BBC.