nerve agent nerve agent

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

The U.K.'s head of Counter Terrorism Policing Neil Basu (right) and the chief medical officer for England Dame Sally Davies, speak at a news conference at New Scotland Yard in London on Wednesday. British police say a couple who are critically ill were exposed to the Russian nerve agent Novichok. John Stillwell/AP hide caption

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John Stillwell/AP

U.K. Police Investigating 2 New Cases Of Deadly Nerve Agent Poisoning

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2 More In Britain Sickened By Nerve Agent Used Against Ex-Russian Spy

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The main entrance to Salisbury District Hospital as Yulia Skripal is discharged from the hospital on April 10, 2018 in Salisbury, England. Russian ex-spy Sergei Skripal and his daughter Yulia Skripal were attacked with nerve agent Novichok in Salisbury on March 4. Chris J Ratcliffe/Getty Images hide caption

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Chris J Ratcliffe/Getty Images

Yulia Skripal speaks to a journalist on Wednesday in London following her March poisoning with a nerve agent in Salisbury along with her father, former Russian spy Sergei Skripal. WPA Pool/Getty Images hide caption

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WPA Pool/Getty Images

Sergei Skripal has left Salisbury District Hospital, one month after his daughter, Yulia, was also discharged. The pair were found poisoned by an exotic nerve agent in March. Peter Nicholls/Reuters hide caption

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Peter Nicholls/Reuters

British Prime Minister Theresa May, center, with German Chancellor Angela Merkel, right, and French President Emmanuel Macron during a news conference following a meeting on the sidelines of the European Union leaders summit in Brussels, on Thursday. Ludovic Marin/AFP/Getty Images hide caption

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Ludovic Marin/AFP/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