Novichok Novichok

A police officer at a cordon in Salisbury, England, in March near to where Russian former double agent Sergei Skripal and his daughter Yulia were found on a bench after they were attacked with a nerve agent. Jonathan Brady/AP hide caption

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Jonathan Brady/AP

British counterterrorism detectives said a "small bottle" is the source of the Novichok that poisoned a couple in Amesbury, England. Mike Kemp/In Pictures via Getty Images hide caption

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Mike Kemp/In Pictures via Getty Images

Assistant Commissioner of Specialist Operations Neil Basu said police spoke on Wednesday with Charlie Rowley, who recently awoke from a 10-day coma caused by exposure to Novichok. Dan Kitwood/Getty Images hide caption

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Dan Kitwood/Getty Images

Detective Sergeant Nick Bailey, who came to the aid of a former Russian spy and his daughter was released from Salisbury District Hospital Thursday after treatment for exposure to a deadly nerve agent. Wiltshire Police/AP hide caption

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Wiltshire Police/AP