Investigators have found traces of the nerve agent used to poison former Russian intelligence officer Sergei Skripal and his daughter in a restaurant where they ate, the BBC reported late on Saturday.
The BBC understood the substance was found in the Italian restaurant Zizzi in the town of Salisbury in southern England where the pair ate on the afternoon of March 4.
Other patrons who ate there at the same time were not believed to be in danger, the report, which did not cite a source, added.
Cordons remain in place at a host of locations across Salisbury, including Skripal's house and the cemetery where his wife and son are buried, news agency Press Association reported.
Skripal - a former colonel in Russian intelligence who was imprisoned in Russia in 2006 on allegations of spying for Britain - was found unconscious with his daughter on a bench near a shopping centre in Salisbury.
Detective Sergeant Nick Bailey, who fell seriously ill after tending to the pair, released a statement from hospital on Saturday saying "he does not consider himself a hero" and was "merely doing his job."
More than 250 officers from Britain's counter-terrorism units are currently involved in investigating the incident, Home Secretary Amber Rudd said earlier on Saturday after chairing a meeting of the nation's top-level Cobra emergency committee.
"I want to stress that they are proceeding with speed and professionalism," Rudd said. "We are putting in enormous resources to ensure that they have all the support that they need to do that."
The Skripals' case has drawn media speculation that Russian state actors could be behind the attack, prompting comparisons to other suspicious deaths of Russians on British soil - specifically Alexander Litvinenko in 2006 and Alexander Perepilichny in 2012.
Skripal, 66, and his daughter Yulia, 33, are still fighting for their lives in hospital after being exposed to the toxic substance. Police say that in total, 21 people have received medical treatment following the incident.
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