The nerve agent used to poison Kremlin critic Alexei Navalny was detected on an empty water bottle from his hotel room in the Siberian city of Tomsk, suggesting he was poisoned there and not at the airport as previously thought, his team said on Thursday.

Mr Navalny fell violently ill on a domestic flight in Russia last month and was subsequently airlifted to Berlin for treatment. Germany says he was poisoned by a Novichok nerve agent. Russia says it has seen no evidence he was poisoned.

A video posted on Mr Navalny's Instagram account showed members of his team searching the room he had just left in the Xander Hotel in Tomsk on August 20, an hour after they learned he had fallen sick in suspicious circumstances.

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