Britain's security minister has dismissed a report that police have identified several Russians who were behind the poisoning of former Russian double-agent Sergei Skripal as "wild speculation".
On Thursday authorities announced they used CCTV footage to identify the attackers, who allegedly poisoned Sergei Skripal and his daughter with a nerve agent.
It was previously reported that British investigators believed the father and daughter were likely poisoned by current or former agents of Russia's military intelligence service.
Experts from the Organisation for the Prohibition of Chemical Weapons (OPCW) are now analyzing the nerve agent that was found at the site of the Skripals attack.
Sky said the investigators were sure the perpetrators were Russian.
The Met Police, who are leading the investigation, have declined to comment.
The UK's Press Association report said police had analysed closed-circuit television and believed several Russians were involved in the attack on the Skripals.
The update into what happened comes as an inquest into the death of Dawn Sturgess, 44, is about to open.
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Earlier, police in Schleswig-Holstein tweeted that there was a major police deployment under way in the city. Police said authorities were still trying to determine the circumstances of and motive for the attack.
The London Metropolitan Police, which is investigating the incident, said they found the source of the nerve agent - a small bottle in Rowley's house.
Britain blames Russia's government for the March attack, a claim Moscow strongly denies.
On Wednesday, worldwide chemical weapons experts completed their investigations in Amesbury, where they sought to identify whether the substance which poisoned the couple was from the same batch used against the Skripals.
Two Britons fell ill last month in a town near Salisbury after being exposed to Novichok, one of whom died.
Senior coroner David Ridley led a brief hearing on the death of Dawn Sturgess, but said the official cause won't be given until further tests are completed.
The Organisation for the Prohibition of Chemical Weapons earlier this week said its inspectors had collected samples in the Amesbury case and were analysing them.
Meanwhile specialist police officers are carrying out a fingertip search of a park within the cordoned-off area with a view to re-opening it to the public.
"It is not known if it is the poisoning of Rowley and Sturgess and the discovery of the bottle that has provided the vital breakthrough".