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Theresa May, the Prime Minister, told the Commons that the chemical that put in hospital Sergei Skripal, a Russian spy who had defected to Britain, his daughter Yulia, and the policeman who visited their home in Salisbury, belonged to a group of nerve agents called Novichok, developed by Russia. She said that Britain must take extensive measures, should there be no adequate explanation from Russia within two days; there was none.