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The poisoning of former Soviet spy, Alexander Litvinenko, with polonium-210 has all the hallmarks of a well-organized state operation, possibly involving the military, according to experts.
Litvinenko's death at the age of 43 from heart failure in a London hospital last Thursday was linked to traces of polonium-210 found in his urine by the UK Health Protection Agency (HPA). An inquest into his death is due to open later this week.