The investigation into the attempted murder of Sergei Skripal has widened, as police sealed off the graves of his late wife, Liudmila, and son, Alexander, and confirmed that a total of 21 people had been treated as a result of the incident.
The police officer who was exposed to the nerve agent used on the Skripals, named on Thursday as DS Nick Bailey, remained in a serious but stable condition.
Bailey was described by Wiltshire’s temporary chief constable, Kier Pritchard, as “a massively dedicated officer”. Pritchard said Bailey was “very anxious, very concerned” but sitting up in bed and talking.
The prime minister, Theresa May, said: “We are all thinking of him, his family, friends and colleagues – and the two other victims – at what is an incredibly difficult time.
“The events of Sunday are a stark reminder, if ever one was needed, of the dangerous situations our emergency services face and the dedication and courage they display every day in order to keep us safe.”
Earlier, the home secretary, Amber Rudd, described the use of a nerve agent in a busy city centre as “attempted murder in the most cruel and public way” as pressure on the government and police for answers continued to grow.