A woman who was poisoned by a military-grade nerve agent in southwest of England has died, days after police think she touched a contaminated item that has not been found.
Speaking to journalists, Assistant Commissioner of Specialist Operations Neil Basu of the Metropolitan Police said he had received test results from the British chemical weapons research establishment at the Porton Down laboratory which confirmed the two victims, who have not been formally identified, were "exposed to the nerve agent Novichok".
"This bad news has only served to strengthen our resolve to identify and bring to justice the person or persons responsible for what I can only describe as an outrageous, reckless and barbaric act", said Neil Basu, chief of the Metropolitan Police's counter-terrorism division.
Officers also evacuated the hostel in Salisbury where Ms Sturgess lived and investigators in hazmat suits were seen swabbing the building and collecting evidence on Friday.
Mr Rowley then visited Boots at around midday before going back to his house half an hour later.
So far, police do not believe that the Amesbury pair were deliberately targeted but are still investigating whether there is a link to the Salisbury poisoning.
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Charles Rowley, 45, who was also exposed to the nerve agent, remains hospitalized in critical condition, police said.
"Dawn leaves behind her family, including three children, and our thoughts and prayers are with them at this extremely hard time", he said.
Britain and its allies blamed Moscow for trying to kill the pair, prompting angry denials that led to an worldwide diplomatic crisis.
He added: "This bad news has only served to strengthen our resolve to identify and bring to justice the person or persons responsible for what I can only describe as an outrageous, reckless and barbaric act".
"Detectives are working as quickly and as diligently as possible to identify the source of the contamination, but this has not been established at this time".
'We would like to reiterate the advice from Public Health England that the risk to the wider public remains low'. "What are the authorities going to say to the parents of a young child who is contaminated with nerve gas because they were in Zizzi or The Mill last Sunday?"
Meanwhile the investigation into the attempted murders of the Skripals is ongoing as detectives continue to assess all the evidence available. Amesbury is located less than 12km from Salisbury.
In a televised statement in the House of Commons, he added that the latest couple is thought to have been exposed to the nerve agent at a location not previously associated with the Skripals incident.