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It's not just Denmark, drones have been sighted at multiple Norwegian airports as well, including confirmed sightings by both police and air force at the main air base in Ørland. (Source in Norwegian, https://www.nrk.no/trondelag/etterforsker-mulig-droneaktivit...)

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In my opinion you really have to be skeptical. Its always possible drone reports are real, but also citings tend to cluster, and there is rarely anything outside of eyewitness reports. Humans are very bad at judging the size and distance of objects in the air, and a flying drone is much harder to spot than people actually imagine. But there is incentives to the state overacting to drone citings, if you're interested in keeping cameras out of public spaces.

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