The request for the tests came from investigators in Germany who are trying to learn how a Russian businessman came to leave traces of the radioactive material , polonium 210 , at sites around Hamburg in the days before he flew to London and met Mr. Litvinenko on Nov. 1 .
Hamburg
Germany
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Germany
Hamburg
/location/location/contains
Germany
Hamburg
/location/country/administrative_divisions
LOCATION
Germany
LOCATION
Hamburg
LOCATION
London