Police are still looking into where the bottle came from and how it came to be in Rowley’s house.<\/b>
\nLONDON \u2014 British detectives investigating the poisoning of two people by the nerve agent Novichok in southern England say scientists have found the source of the deadly substance.
One of the victims, 44-year-old Dawn Sturgess, died in a hospital Sunday after exposure to the nerve agent.
Her partner, 45-year-old Charlie Rowley, was in critical condition, but has since regained consciousness.
The Metropolitan Police said in a news release Friday that a small bottle found during searches of Rowley\u2019s house Wednesday was tested and scientists confirmed the substance in the bottle was Novichok.
\u201cThis is clearly a significant and positive development. However, we cannot guarantee that there isn\u2019t any more of the substance left and cordons will remain in place for some considerable time,\u201d Metropolitan Police Assistant Commissioner Neil Basu said in a statement.
Police are still looking into where the bottle came from and how it came to be in Rowley\u2019s house. Further tests will be carried out to establish whether it is from the same batch that contaminated Russian ex-spy Sergei Skripal and his daughter in March. Nearly 100 detectives from the Counter Terrorism Policing Network are investigating the case alongside Wiltshire Police, the release said.
\u00a9 2018 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.<\/p>\n

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