The Guardian is reporting that British intelligence is now looking into this theory for the death of Litvinenko. Having access to polonium-210 limits the possibilities to those with government access but there is still much more to be researched.
While ruling out any official involvement by Vladimir Putin's government, investigators believe that only those with access to state nuclear laboratories could have mounted such a sophisticated plot.
Police were last night closing in on a group of men who entered the UK among a large crowd of Muscovite football fans. The group of five or more arrived shortly before Mr Litvinenko fell ill and attended the CSK Moscow match against Arsenal at the Emirates stadium on November 1. They flew back shortly afterwards. While describing them only as witnesses, police believe their presence could hold the key to the former spy's death.
Last night, the Irish government said it was launching a separate investigation focussing on the former Russian prime minister Yegor Gaidar, who fell ill during a visit to Ireland a week ago. At first Mr Gaidar's entourage thought he was suffering from something he had eaten. But yesterday one of his aides said doctors suspected he had been poisoned.
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