The Oslo Kalemmun International Airport in Norway was announced closure on the morning of 23 September local time due to the discovery of an unknown drone.

The Norwegian national radio broadcaster quoted a Norwegian Air Force spokesman as saying that at the moment, all flights departing from Kalemmun International Airport will be arranged for other airports.

Norwegian police say there is "no direct link" between the incident and the drone incident at the airport in Copenhagen, Denmark.

On the evening of 22nd, Copenhagen Kestrup International Airport suspended the take-off and landing of aircraft for about 4 hours due to the discovery of multiple unknown drones. During this period, all flights were cancelled, postponed or diverted to nearby airports. In the early morning of the 23rd local time, Kestrup International Airport announced the resumption of operations.

According to Danish media reports on the 23rd, Danish police have deployed large-scale police forces at the airport and nearby areas, and are investigating this incident.