The radioactive material, intended for unauthorized sale, was seized Monday in Moscow and a number of people were arrested, said Sergei Vasilyev, a spokesman for the Federal Counterintelligence Service.
It was not immediately clear from where the uranium originated, and few other details were available.
The stolen material was not weapons-quality, said Vasilyev. Uranium-238, used to produce fuel for nuclear power plants, can be bought in Russia from authorized dealers and costs $100 to $200 a kilogram, according to nuclear authorities.
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