The police officer who rushed to the aid of a Russian ex-spy targeted with a nerve agent has been named as Sergeant Nick Bailey.
The Wiltshire Police officer is said to be talking in his hospital bed but is still in a serious condition following the attack in which a nerve agent was used in an attempt on the lives Sergei Skripal, 66, and 33-year-old daughter Yulia.
It comes amid a flurry of activity in Salisbury, where police sealed off the gravestone of Mr Skripal's wife Liudmila, who was buried in 2012, and the memorial stone of his son, Alexander, who was cremated last year.
They are located at separate sites in the London Road Cemetery with each guarded by a police officer.
Counter-terror police are working to unravel what is now feared to be a sophisticated chemical weapon plot amid heightened tensions between Britain and Russia.
Earlier on Thursday, Home Secretary Amber Rudd said the use of a chemical weapon on UK soil was a "brazen and reckless act" and the Government stood ready to act as a clearer picture emerged.