British police are investigating the death of Russian businessman Boris Berezovsky after he was found dead at his UK home in unclear circumstances.

UK police have found no sign of radiation or chemicals during searches of former Russian oligarch Boris Berezovsky's home near London and say there is no evidence anyone else was involved in his still unexplained death.

Once known as the "godfather of the Kremlin", the former billionaire powerbroker helped Vladimir Putin rise to the top before falling out of favour himself and fleeing in 2000 to Britain where he became one of the president's biggest critics.

A day after the 67-year-old's body was found in the locked bathroom of his imposing country mansion, police said it was still unclear how he had died.

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