Novichok Novichok

Spiez Laboratory is believed to have been involved with the analysis of chemical agents used in the U.K. It was allegedly targeted by Russian agents earlier this year. Fabrice Coffrini/AFP/Getty Images hide caption

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Fabrice Coffrini/AFP/Getty Images

A still image taken from a video released by the RT TV shows two Russian men who say they are Ruslan Boshirov (left) and Alexander Petrov. British police accuse the pair of being intelligence officers who tried to kill former KGB spy Sergei Skripal. RT via Reuters hide caption

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RT via Reuters

A specialist team member in a police protective suit in Salisbury, England, last month. British police scoured sections of Salisbury and Amesbury in southwest England, searching for a container feared to be contaminated with traces of the deadly nerve agent Novichok. Matt Dunham/AP hide caption

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Matt Dunham/AP

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