Public Health England (PHE) has released a statement following the doscovey of a bottle of Novichok at Charlie Rowley's house.
The organisation says it has not seen any further cases of illness linked to the Amesbury incident, which has left 45-year-old Rowley recovering in hospital, while his partner, Dawn Sturgess, 44, passed away on Sunday.
However, PHE are warning people to not pick up any strange items.
In response to the latest police statement on the current situation in Amesbury and Salisbury the risk to the public remains low. We have not seen any further cases of illness linked to this incident.
As a precaution Public Health England continues to strongly advise the public not to pick up any strange items such as syringes, needles, cosmetics or similar objects made of materials such as metal, plastic or glass.
The advice remains “if you didn’t drop it, then don’t pick it up”.
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A "very small amount" of the Novichok nerve agent was used in the attack, with the substance delivered in a "liquid form", the Department for Environment, Food and Rural Affairs has said.
The details emerged at a press briefing in Salisbury, where reporters were told the highest concentration was found at Mr Skripal's house.
Clean-up work is set to begin at nine sites across the city, as a tenth, an area of the London Road cemetery - which was found not to be contaminated - will reopen to the public on Tuesday.
"We either know there is contamination there (in the nine sites) or we think there is a probability we could find contamination there," Defra said.
Salisbury residents have been warned to expect a step-up in activity as investigators wearing protective clothes remove items and chemically clean the areas.
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Police have cordoned off a stretch of Hyde Road, in Gillingham, Dorset, and Army personnel and vehicles were pictured entering the cordon on social media.
This follows an incident in Salisbury in which a former Russian spy and daughter where poisoned using a nerve agent.
An recovery vehicle could be seen inside the area.
The military is assisting police to remove a number of vehicles and items from areas of Dorset, following the incident in Salisbury.
The public should not be alarmed and the public health advice remains the same. The military has the expertise and capability to respond to a range of contingencies.
The Ministry of Defence regularly assists the emergency services and local authorities in the UK. Military assistance will continue as necessary during this investigation.
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