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Police say that they have identified a specific nerve agent [bbc.com] as being used in an attempt to kill a Russian who once spied for the UK. They have not named the nerve agent that was used. Officers who responded to the scene have also been hospitalized:
A nerve agent was used to try to murder a former Russian spy and his daughter, police have said. Sergei and Yulia Skripal were found unconscious in Salisbury on Sunday afternoon and remain critically ill. A police officer who was the first to attend the scene is now in a serious condition in hospital, Assistant Commissioner Mark Rowley said.
[...] Mr Rowley, head of Counter Terrorism Policing, said government scientists had identified the agent used, but would not make that information public at this stage. "This is being treated as a major incident involving attempted murder, by administration of a nerve agent," he said. "Having established that a nerve agent is the cause of the symptoms... I can also confirm that we believe that the two people who became unwell were targeted specifically."
[...] Two other police officers who attended the scene were treated in hospital for minor symptoms, before they were given the all clear. It is understood their symptoms included itchy eyes and wheezing.
Previously: Former Russian Spy Exposed to "Unknown Substance" in Salisbury, England [soylentnews.org]