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Sergei Skripal and his daughter was poisoned with Novichok of a "high purity," the Organisation for the Protection of Chemical Weapons said on Thursday.
The confirmation of the chemical's identity bolsters Britain's case that Russia was behind the attack last month.
Britain accused Russia of manufacturing the poison used in the attack in a secretive military lab last month. Russia has repeatedly denied it and even pushed multiple contradictory theories to claim they weren't behind the attack.
More follows.