Ex-Russian spy dies in hospital
There is confusion over what has poisoned the ex-spy
Former Russian spy Alexander Litvinenko has died in hospital three weeks after apparently being poisoned in London.
University College Hospital, London, said Mr Litvinenko, 43, died at 2121 GMT on Thursday and the cause of his condition was still being investigated.
Friends have said the ex-KGB agent was poisoned because of his criticism of Russian President Vladimir Putin - Russia has denied any involvement.
Scotland Yard said they were now investigating "an unexplained death".
bbc.com
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