They warned the public not to be alarmed.
Police say it is their priority to find the container believed to have been handled by the pair.
Police seized a auto in Swindon on Monday as part of their ongoing investigation into the poisoning.
"The public health advice remains the same, with the current risk to the public remaining low, but anyone with concerns can call the dedicated helpline that has been set up in Wiltshire on 0800 092 0410. Those involved have the training & expertise to safely remove the vehicle". It is thought Rowley travelled in the van shortly before collapsing.
When asked if the vehicle was being taken to the government laboratory at Porton Down for testing, there was no immediate response.
The Metropolitan police assistant commissioner, Neil Basu, said on Monday that the substance that led to Sturgess and Rowley falling ill was in a vessel or container when the couple came across it.
Police have opened a murder investigation after Sturgess died in hospital on Sunday night.
On Monday, Basu said Sturgess and Rowley received a high dose of novichok after handling a container containing the nerve agent.
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Authorities have broadened their investigation into the nerve agent poisoning of an English couple, seizing a auto in a third community in southwestern England.
Six locations visited by the couple in Salisbury have been cordoned off, including Mr Rowley's home on Muggleton Road in Amesbury, a Boots shop and a baptist church.
Detectives are investigating whether the Skripal poisonings and those of Mr Rowley and Ms Sturgess are linked. Wiltshire police said all had been assessed, screened and discharged.
A lot of government members were missing from the chamber because the Conservative 1922 parliamentary committee - which includes all Tory backbenchers - was taking place at the same time as the Home Secretary's Amesbury update.
"It was subsequently taken to DSTL and following further scientific advice, the investigation team also carried out forensic enquiries on the bus as they look to establish the point at which Dawn and Charlie were contaminated with the nerve agent". Britain has blamed Moscow for the attack on the Skripals.
Boris Johnson, who was still Foreign Secretary at the time, was also missing, as well as Defence Secretary Gavin Williamson and Chancellor of the Exchequer Philip Hammond.
"That is something that I think the world will unite with us in actually condemning".