Emergency services vehicles used in response to the Novichok poisonings have been buried in a landfill site close to a village of 13,000 people.
The Russian nerve agent killed Dawn Sturgess, 44, and left her boyfriend Charlie Rowley, 45, fighting for his life.
They were believed to have picked up a vial containing the substance which was used to poison former spy Sergei Skripal and his daughter Yulia earlier in the year.
The Russian nerve agent killed Dawn Sturgess (left), 44, and left her boyfriend Charlie Rowley (right), 45, fighting for his life
Authorities were faced with a decision about whether to incinerate vehicles which may have been contaminated, or whether to bury them in landfill, and decided on the latter option.
The Department for Environment, Food and Rural Affairs (Defra) confirmed that some vehicles have been buried at Wingmoor Farm, near Bishops Cleeve, and more will follow.
A Defra spokesman said: 'The clean-up work in south Wiltshire has been underway for some time and any potentially contaminated items continue to be removed and stored securely before being disposed of safely.
'As part of this work, following review by specialist teams, some of the vehicles involved in the response to the incident in March have been moved to a hazardous waste landfill site.
'Our number one priority is making sure that the identified sites are safe, so they can be returned to