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SALISBURY, ENGLAND - MARCH 07:  A police tent is seen behind a cordon outside The Maltings shopping centre where a man and a woman were found critically ill on a bench on March 4 and taken to hospital sparking a major incident, on March 7, 2018 in Wiltshire, England. Sergei Skripal, who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010, and his daughter remain critically ill after being exposed to an 'unknown substance'.  (Photo by Matt Cardy/Getty Images)
SALISBURY, ENGLAND - MARCH 07:  A police tent is seen behind a cordon outside The Maltings shopping centre where a man and a woman were found critically ill on a bench on March 4 and taken to hospital sparking a major incident, on March 7, 2018 in Wiltshire, England. Sergei Skripal, who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010, and his daughter remain critically ill after being exposed to an 'unknown substance'.  (Photo by Matt Cardy/Getty Images)

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    Police: Russian spy was deliberately poisoned

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Police: Russian spy was deliberately poisoned

UK police say former Russian spy Sergei Skripal and his daughter were deliberately poisoned by a nerve agent. The case is now being investigated as "attempted murder by a nerve agent." Officials are calling for an investigation of more than a dozen other people linked to Russia. CNN's Phil Black reports

Police: Russian spy was deliberately poisoned

UK police say former Russian spy Sergei Skripal and his daughter were deliberately poisoned by a nerve agent. The case is now being investigated as "attempted murder by a nerve agent." Officials are calling for an investigation of more than a dozen other people linked to Russia. CNN's Phil Black reports