London: British counter-terrorism police were on Tuesday investigating the unexplained death of a Russian associate of late tycoon Boris Berezovsky, but said the death was not thought to be linked to a nerve agent attack on a former Russian double agent.

Nikolai Glushkov, 68, was discovered dead late on Monday at an address in Clarence Avenue in suburban south-west London.

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British police, who did not name Glushkov, said that they were investigating the death of a man in his 60s who lived on Clarence Avenue.

Police said the death was not linked to the poisoning of Sergei Skripal and his daughter in Salisbury.