A eerie turquoise light spotted over Norway has sparked a mystery, with suggestions it could be a missile test.
The Norwegian Metrological Institute has received hundreds of phonecalls from confused observers but so far has been unable to identify its origin.
Some experts have speculated that the phenomenon might have been caused by a Russian rocket launch. However, the Russian embassy insists such claims are completely unfounded.
Neither meteorologists, astronomers, or the Armed Forces have offered a solution to the matter.
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