Police and military personnel seized a auto from a quiet residential street in Swindon as part of their ongoing into the nerve agent incident in Salisbury and Amesbury.
The couple had come across what police believe was a container likely to have been discarded when Sergei Skripal, a former Russian spy, was targeted with novichok in Salisbury.
Local residents said the paramedic had told them he got bodily fluids on him, but he had been checked over by doctors and given the "all-clear". "Those involved have the training & expertise to safely remove the vehicle" and the risk to the public remains low".
Dawn Sturgess. 44, died after consuming the nerve agent while her boyfriend Charlie Rowley, 45, is still fighting for his life in hospital.
The man who fell ill after he was exposed to the nerve agent novichok in Amesbury has made a "small but significant improvement". "Charlie is still very unwell".
A bus that Ms Sturgess and Mr Rowley used the night before they collapsed has also tested negative for the deadly agent.
Sturgess died Sunday, leaving behind her three children, police said.
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"Her death has only served to strengthen the resolve of the investigations team", he said, saying the immediate police priority is to find any container that may be the source of the Novichok.
A tweet by police said, "the public should not be alarmed by this". The search is focused on their homes and a park in Salisbury.
Britain and its allies blamed Russia for the attack on the Skripals, prompting a major Western expulsion of Russian diplomats. Peskov added that such attacks present a danger not only inside the United Kingdom, but also in Europe as a whole.
Asked whether the death could cloud the upcoming US-Russia summit in Helsinki next week, Peskov replied that the poisoning "has no relation" to the meeting.
The family of Ms Sturgess did not comment on the investigation and said they wanted people to 'stop speculating about Dawn and what has happened'.
Moscow said London has declined its offers for a joint investigation into the poisonings.