LONDON - A rare radioactive substance killed an ex-KGB spy turned Kremlin critic, the British government said Friday. In a dramatic statement written before he died, the man called Russian President Vladimir Putin "barbaric and ruthless" and blamed him personally for the poisoning.

British police officer cordons off the pavement area in front of a closed sushi food bar, which is believed to be where former Russian spy Alexander Litvinenko had lunch with Italian academic Mario Scaramella, before he fell sick, in central London's Piccadilly, Friday Nov. 24, 2006. [AP]

Putin, in Finland, offered his condolences for the death of Alexander Litvinenko and denied any involvement. He called the release of the deathbed statement a "political provocation" by his opponents.

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Litvinenko died late Thursday at a London hospital after spending days in intensive care as doctors puzzled over what was causing his organs to fail and attacking his bone marrow and destroying his immune system.

Britain's Health Protection Agency said Friday that the radioactive element polonium-210 had been found in his urine, and the police said traces of radiation were found at Litvinenko's home and a ritzy hotel bar and sushi restaurant he visited on the day he became ill.

Police said they were treating the case as an "unexplained death" - but not yet as a murder.

The 43-year-old Litvinenko, who fiercely criticized Putin's government from his refuge in London since 2000, told police he believed he was poisoned Nov. 1 while investigating the October slaying of Russian journalist Anna Politkovskaya, another critic of Putin.

Litvinenko's statement, read by his friend Alex Goldfarb to reporters outside the hospital, put the blame for his death squarely on Putin.

He accused Putin of having "no respect for life, liberty or any civilized value."

"You may succeed in silencing me but that silence comes at a price. You have shown yourself to be as barbaric and ruthless as your most hostile critics have claimed," the statement said.

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