• Hard to pin blame for spy death - Europe - MSNBC.com
  
  The polonium-210 that doctors believe killed Kremlin critic and former spy Alexander Litvinenko could have come from Russia, but it will be difficult for investigators to pinpoint blame for the death even if the origin of the radioactive substance is determined, nuclear experts said Saturday.
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• Who's who in the spy poisoning mystery - CNN.com
  Who's who in the spy poisoning mystery
  British detectives investigating the death of the former Russian spy Alexander Litvinenko are now pursuing inquiries in both London and Moscow. CNN's The Briefing Room has compiled a guide to who's who in the spy scandal.
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