The world's chemical watchdog is to meet behind closed doors today, after a British laboratory said it had not proved that Russia manufactured a deadly nerve agent used to poison a former Russian spy.
The talks at the Organisation for the Prohibition of Chemical Weapons (OPCW) have been requested by Moscow which said it wanted to "address the situation around the allegations... in regards to the incident in Salisbury."
But he added: "We have not identified the precise source."
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