Summary
British police raced Tuesday to identify an unknown substance that left a former Russian double agent fighting for his life, as Moscow said it had no information about the "tragic" incident.
Britain's chief counter-terrorism officer, Mark Rowley of London's Metropolitan Police, said specialist members of his team were supporting the investigation.
Skripal was sentenced to 13 years in jail in Russia in 2006 for betraying Russian intelligence agents to Britain's MI6 secret service.
He was pardoned before being flown to Britain as part of a high-profile spy swap between Russia and the United States in 2010 .
Putin's spokesman Dmitry Peskov said Tuesday that it had no information on the Salisbury incident.
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