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A tent used by police forensic investigators covers the grave of Alexander Skripal; son of former Russian spy Sergei Skripal; at the London Road cemetery in Salisbury, Britain, March 9, 2018.
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A police evidence tent is seen in a back garden on the road where former Russian inteligence agent Sergei Skripal lives, in Salisbury, Britain March 11, 2018.
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A police officer stands at a cordon placed around a payment machine covered by a tent in a supermarket car park near to where former Russian intelligence agent Sergei Skripal and his daughter Yulia were found poisoned in Salisbury, Britain, March 13, 2018.
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Police officers walk past a gazebo over the grave of Liudmila Skripal; the wife of former Russian spy Sergei Skripal; at the London Road cemetery in Salisbury, Britain, March 9, 2018.
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A police officer stands on duty outside a pub which has been secured as part of the investigation into the poisoning of former Russian intelligence agent Sergei Skripal and his daughter Yulia, in Salisbury, Britain March 12, 2018.
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Salisbury Cathedral, in the centre of the city in which former Russian intelligence officer Sergei Skripal and a woman were found unconscious after they had been exposed to an unknown substance is seen at dawn in Salisbury, March 7, 2018.
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A police officer stands on duty outside a pub which has been secured as part of the investigation into the poisoning of former Russian intelligence agent Sergei Skripal and his daughter Yulia, in Salisbury, Britain March 12, 2018.
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A police officer stands behind a cordon placed around a payment machine covered by a tent in a supermarket car park near to where former Russian intelligence agent Sergei Skripal and his daughter Yulia were found poisoned in Salisbury, Britain, March 13, 2018.
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The forensic tent, covering the bench where Sergei Skripal and his daughter Yulia were found, is repositioned by officials in protective suits in the centre of Salisbury, Britain, March 8, 2018. REUTERS/Peter Nicholls
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Police officers work at a supermarket near the bench where former Russian intelligence officer Sergei Skripal and his daughter Yulia were found poisoned, in Salisbury, Britain, March 12, 2018.
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A police officer stands guard at a car recovery depot in Norton Enterprise Park, where Sergei Skripal's car was originally transported, in Salisbury, Britain, March 13, 2018.
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Members of the emergency services in protective suits work at the site of the grave of Luidmila Skripal, wife of former Russian inteligence officer Sergei Skripal, at London Road Cemetery in Salisbury, Britain, March 10, 2018.
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Chairs are seen on tables inside the Mill pub which former Russian inteligence officer Sergei Skripal and his daughter Yulia visited before they were found poisoned on a bench nearby in Salisbury, Britain, March 11, 2018.
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Members of the emergency services put on protective suits near to the grave of Luidmila Skripal, wife of former Russian intelligence agent Sergei Skripal, at the London Road Cemetery in Salisbury, Britain, March 10, 2018.
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Police officers stand on duty at a road block on the road where former Russian inteligence agent Sergei Skripal lives, in Salisbury, Britain March 11, 2018.
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Police officers stand on duty outside a pub which has been secured as part of the investigation into the poisoning of former Russian intelligence agent Sergei Skripal and his daughter Yulia, in Salisbury, Britain March 12, 2018.
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Police officers get dressed in protective suiting at a car recovery depot in Norton Enterprise Park, where Sergei Skripal's car was originally transported, in Salisbury, Britain, March 13, 2018.
Russian double agent poisoned in Britain
British authorities investigate the poisoning of former Russian double agent Sergei Skripal and his daughter with military-grade nerve agent in Salisbury.