Moscow - British prosecutors' chief suspect in the killing of ex-KGB agent Alexander Litvinenko said on Thursday that British intelligence services had a hand in the poisoning - a claim likely to further damage relations between Moscow and London.
Andrei Lugovoi told a news conference that he had evidence to back up his claim but would only give details to Russian investigators.
Lugovoi, a Moscow businessman, met with Litvinenko on November 1 in London, hours before Litvinenko fell ill.
Britain last Friday formally requested Lugovoi's extradition to face murder charges. Russia refuses to hand him over, but says it could prosecute him at home if Britain presents enough evidence.
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