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There is no evidence so far that a "third party" was involved in the death of Boris Berezovsky, BBC reported, citing police.

Earlier, the Russian tycoon's house in Berkshire was given the all-clear after it was searched by police for chemical, biological and nuclear material.

Thames Police said Mr Berezovsky, 67, was found by an employee dead on his bathroom floor on Saturday afternoon. The door was locked from the inside.

A Home Office post-mortem examination is to be carried out.

Mr Berezovsky emigrated to the UK in 2000 after falling out with Russia's president, and was granted asylum in 2003.

Police are treating the death as unexplained, while scenes-of-crime officers are currently inside the property carrying out a full forensic examination of the scene.

"It would be wrong to speculate on the cause of death until the post-mortem has been carried out. We do not have any evidence at this stage to suggest third party involvement," Det Ch Insp Kevin Brown of Thames Valley Police said.