The death of Boris Berezovsky is yet another turn in the extraordinary story of a man who went from a poorly paid Soviet mathematics professor to a multi-billionaire oligarch in just over a decade.
Rumours abound Berezovsky committed suicide but in the shadowy world of Russian politics and KGB skullduggery authorities are taking no chances.
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Specialist officers in chemical, biological, radiological and nuclear substances searched his mansion over the weekend looking for clues to the as-yet unexplained death.
