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British police confirmed a bottle of Novichok was found in the house of a man poisoned by the deadly nerve agent.
Police said they found a "small bottle" containing Novichok in Charlie Rowley's home in Amesbury. He and his partner, Dawn Sturgess, were found poisoned on June 30. Sturgess died just over a week later. Rowley has regained consciousness.
Novichok is the same Soviet-developed nerve agent that poisoned Sergei and Yulia Skripal in March. That happened in Salisbury, only a few miles away from Amesbury.
Authorities are now running tests to see if both instances were caused by the same batch of nerve agent.