According to the Guardian, investigators believe a former double agent Sergei Skripal and his daughter was poisoned nervously-paralytic substance. What is the publication is not called. However, States that two of the most known toxic substances in this class are sarin and VX.
Currently the investigation finds out what nerve poisons can be found in the UK, and how they came to the country.
Sergei Skripal and his daughter remains difficult.
5 Mar 66-year-old Sergei Skripal and his daughter was discovered unconscious in a shopping centre The Maltings in Salisbury (Wiltshire, southern England).
Note that the day before the publication DevonLive she wrote that the investigation established that the man and woman were poisoned by a synthetic analgesic fentanyl, its biological effects similar to the effects of heroin, but much stronger. Newspaper the Times wrote that the version of the poisoning fentanyl is considered, however, is not the only and main.
Colonel Sergei Skripal to 1999 served in the main intelligence Directorate of the General staff. In 2004, he was arrested, and two years later sentenced to 13 years in strict regime for the transfer to British intelligence information about Russian agents working undercover in Europe. Russia claims that Skripal worked for foreign intelligence since the 90-ies and for the information he was paid 100 thousand dollars. In 2010, he and three other convicts in Russia were pardoned under exchange transactions between Russian, British and American intelligence agencies. He returned to Russia ten agents uncovered in the US, including Anna Chapman.