A police officer was also taken into intensive care after being contaminated when he went to Sergei Skripal's house. By 22 March he had recovered enough to leave the hospital. An additional 48 people sought medical advice after the attack, but none required treatment.[a]
Later in March, the British government accused Russia of attempted murder and announced a series of punitive measures against Russia, including the expulsion of diplomats. The UK's official assessment of the incident was supported by 28 other countries which responded similarly. Altogether, an unprecedented 153 Russian diplomats were expelled. Russia denied the accusations and responded similarly to the expulsions and "accused Britain of the poisoning."
On 30 June 2018 a similar poisoning of two British nationals in Amesbury, seven miles from Salisbury, involved the same nerve agent. A man found the nerve agent in a perfume bottle and gave it to a woman who sprayed it on her wrist. The woman, Dawn Sturgess, fell ill within 15 minutes and died on 8 July, but the man who also came into contact with the poison survived. British police believe this incident was not a targeted attack, but a result of the way the nerve agent was disposed of after the poisoning in Salisbury.
On 5 September 2018, British authorities identified two Russian nationals, using the names Alexander Petrov and Ruslan Boshirov, as suspected of the Skripals' poisoning, and alleged that they were active officers in Russian military intelligence. On 13 September the two men were interviewed on Russian television where they claimed they were tourists visiting the city.
At 16:15 an emergency services call reported that Sergei Skripal, a 66-year-old resident of Salisbury, and his 33-year-old daughter Yulia had been found unconscious on a public bench in the centre of Salisbury by a passing doctor and nurse. An eyewitness saw Yulia foaming at the mouth with her eyes wide open but completely white. According to a later British government statement they were "slipping in and out of consciousness on a public bench".
According to the UK government, the two were poisoned with a nerve agent. The police declared a major incident as multiple agencies were involved. Following the incident, health authorities checked 21 members of the emergency services and the public for possible symptoms; two police officers were treated for possible minor symptoms, said to be itchy eyes and wheezing, while one, Detective Sergeant Nick Bailey, who had been sent to Sergei Skripal's house, had been in a serious condition.
On 22 March 2018, Detective Sergeant Nick Bailey was discharged from the hospital. In a statement he said "normal life for me will probably never be the same" and also thanked the hospital staff. As of 26 March 2018, Skripal and his daughter remained critically ill. On 29 March 2018 it was announced that Yulia Skripal's condition was improving and she was no longer in a critical condition. On 5 April 2018 doctors said that Sergei Skripal was no longer in critical condition and was responding well to treatment. On 9 April 2018, Yulia Skripal was discharged from hospital and taken to a secure location. On 18 May 2018, Sergei Skripal was discharged from the hospital too. On 23 May 2018, a handwritten letter and a video statement by Yulia Skripal were released to the media for the first time after the poisoning. She stated that she was lucky to be alive after the poisoning and thanked the staff of the Salisbury hospital. She described her treatment as slow, heavy and extremely painful and she had a scar on her neck, apparently from a tracheotomy. She expressed her hope that someday she would return to Russia. She thanked the Russian embassy for its offer of assistance but said she and her father were "not ready to take it".
On 17 March 2018, The Sun reported that the Skripals' vet had contacted the police on 4 March regarding the Skripals' pet cat and two guinea pigs and said the "cat and the guinea pigs were removed from the house and taken away to be assessed." On 5 April 2018, British authorities said that inside Sergey Skripal's house, which had been sealed by the police, two guinea pigs were found dead by vets, when they were allowed in, along with a cat in a distressed state. The guinea pigs were reported to have died of dehydration; the cat was taken for testing to the Porton Down chemical weapons facility, where all three bodies were incinerated.