Inside Moscow Danger on Russian Subways and Trains

MOSCOW -- Increasingly, radioactive materials are turning up on public transport, raising serious safety questions. Last week police arrested a train rider for carrying radioactive matter. Afterward a research facility said the man was its courier, claimed the material posed "no danger" and admitted it regularly used passenger trains to transport radioactive substances. In November a thief was arrested after carrying uranium-235 on the subway, and in December two men were arrested after riding with a stolen cache of potentially explosive cesium. Both materials can be deadly.