An international body reported that sensors in Stockholm had picked up tiny amounts of unusual radioactive isotopes produced by nuclear fission.
Finnish nuclear safety authority STUK said it had also found tiny amounts of nuclear particles in samples collected on its southern coast.
Asked about reports that Russia could have been the source of a leak, Kremlin spokesman Dmitry Peskov said: “We have an absolutely advanced radiation levels safety monitoring system and there are no any emergency alarms.
The Comprehensive Nuclear Test Ban Treaty Organisation (CTBTO), which monitors the world for evidence of nuclear weapons tests, said one of its stations scanning the air for radioactive particles had found unusual, although harmless, levels of caesium-134, caesium-137 and ruthenium-103.
The TASS news agency, citing Rosenergoatom, a unit of the state nuclear company Rosatom, said over the weekend that Russia's two northwest nuclear power plants, in Leningrad and Kola, were working normally and radiation levels were unchanged.
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