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Russian spy: What we know so far Russian spy: What we know so far
(1 day later)
Police are investigating two attempted murders after a former Russian spy and his daughter were exposed to a nerve agent in Salisbury, Wiltshire. Russia is highly likely to be behind the attempted murder of a former spy and his daughter with a nerve agent, the prime minister has said.
Sergei Skripal, 66, and Yulia Skripal, 33, remain in a critical but stable condition after being found slumped on a bench near the Maltings shopping centre on Sunday 4 March. Sergei Skripal, 66, and Yulia Skripal, 33, remain in a critical but stable condition after being found slumped on a bench near the Maltings shopping centre in Salisbury, Wiltshire, on Sunday 4 March.
The first police officer to reach the scene remains seriously ill in hospital but has been talking to his family. A police officer who fell ill tending to the pair remains seriously ill in hospital.
Traces of a nerve agent have been found at the restaurant where they ate on Sunday afternoon, and at a nearby pub. Theresa May said the chemical used in the attack has been identified as being part of a group of nerve agents developed by Russia known as Novichok.
Home Secretary Amber Rudd described the attack as brazen and cruel. Russia has been told to provide "full and complete disclosure" of the Novichok programme to the Organisation for the Prohibition of Chemical Weapons by the end of Tuesday.
Russia has denied any involvement. UK Foreign Secretary Boris Johnson says the country will respond "robustly" if Moscow is found to have been behind the incident.
Timeline of eventsTimeline of events
Mr Skripal and his daughter Yulia are believed to have been in Salisbury city centre from 13:30 GMT on 4 March.Mr Skripal and his daughter Yulia are believed to have been in Salisbury city centre from 13:30 GMT on 4 March.
A witness told the BBC that he saw the pair in the Zizzi restaurant at about 14:00 GMT.A witness told the BBC that he saw the pair in the Zizzi restaurant at about 14:00 GMT.
Mr Skripal was found alongside his daughter on a bench near the Maltings shopping centre, a short walk away.Mr Skripal was found alongside his daughter on a bench near the Maltings shopping centre, a short walk away.
At about 16:15 GMT officers were alerted to the incident.At about 16:15 GMT officers were alerted to the incident.
Eyewitness Freya Church said she saw a man and a woman looking unwell on a bench on the afternoon of 4 March.Eyewitness Freya Church said she saw a man and a woman looking unwell on a bench on the afternoon of 4 March.
"They looked so out of it that I thought even if I did step in I wasn't sure how I could help," she said.
Another passer-by, Jamie Paine, said the woman he saw was frothing at the mouth and her eyes "were wide open but completely white".Another passer-by, Jamie Paine, said the woman he saw was frothing at the mouth and her eyes "were wide open but completely white".
A doctor, who was shopping with her husband in the city centre on Sunday, told the BBC she stepped in to help Ms Skripal after she found her on the bench. A doctor, who was shopping with her husband in the city centre on Sunday, said Ms Skripal was "slumped in her seat, completely unconscious" and had lost control of her bodily functions.
She said the 33-year-old was "slumped in her seat, completely unconscious" and had lost control of her bodily functions. A police officer who fell ill after attending the incident - Det Sgt Nick Bailey - was also taken to hospital and placed in intensive care. He remains in a serious condition.
The pair, who did not have any visible injuries, were taken to Salisbury District Hospital by paramedics where they are being treated in intensive care.
The first police officer to reach the scene - Detective Sergeant Nick Bailey - was also taken to hospital and placed in intensive care.
On Saturday, Amber Rudd said he remained "seriously ill" but had been talking to his family in hospital.
In a statement, Det Sgt Bailey said he did not "consider himself a hero" and was "merely doing his job".
The investigation so farThe investigation so far
Police say the pair were poisoned by a nerve agent and are treating the case as attempted murder. Police have been treating the case as attempted murder.
Traces of it were found at the Mill pub and Zizzi restaurant, where the Skripals spent the afternoon. Traces of the nerve agent were found at the Mill pub and Zizzi restaurant, where the Skripals spent the afternoon.
Up to 500 people who visited the pub or the restaurant on Sunday or Monday are being told to wash their clothes and possessions to avoid any contamination.Up to 500 people who visited the pub or the restaurant on Sunday or Monday are being told to wash their clothes and possessions to avoid any contamination.
Prof Dame Sally Davies, the chief medical officer for England, stresses the risk of harm is "low" but there was some concern that prolonged exposure over weeks and months could cause health problems.Prof Dame Sally Davies, the chief medical officer for England, stresses the risk of harm is "low" but there was some concern that prolonged exposure over weeks and months could cause health problems.
Assistant Commissioner Mark Rowley, head of counter-terrorism operations, said the Skripals had been "targeted specifically".Assistant Commissioner Mark Rowley, head of counter-terrorism operations, said the Skripals had been "targeted specifically".
Police say the agent used has been identified but they are not making that information public.
Officers have identified more than 240 witnesses and are looking at about 200 pieces of evidence.Officers have identified more than 240 witnesses and are looking at about 200 pieces of evidence.
More than 250 counter-terrorism officers are involved in the investigation, as about 180 military personnel were deployed to help remove vehicles and objects which may have been contaminated.More than 250 counter-terrorism officers are involved in the investigation, as about 180 military personnel were deployed to help remove vehicles and objects which may have been contaminated.
Personnel from the Defence Chemical Biological Radiological and Nuclear Centre, which is a specialist site for chemical warfare experts, have also been drafted in. Personnel from the Defence Chemical Biological Radiological and Nuclear Centre at Porton Down in Wiltshire identified the nerve agent.
Cordons remain around Zizzi, the Mill pub, Mr Skripal's Salisbury home and the graves of Mr Skripal's wife and son at a nearby cemetery. How has the government responded?
The government wants answers from the Russian leadership.
Mrs May said: "Should there be no credible response, we will conclude that this action amounts to an unlawful use of force by the Russian state against the United Kingdom."
She said the decision to blame Russia is based on "Russia's record of conducting state-sponsored assassinations and our assessment that Russia views some defectors as legitimate targets for assassinations".
Russia has until the end of Tuesday to respond to the government's requests.
If it does not, Mrs May said she would outline the UK's next actions on Wednesday.
What has Russia said?
Russia has dismissed suggestions linking Moscow to the incident.
Putin, power and poison: Russia’s elite FSB spy club
Russian Duma MP Andrei Lugovoi called Mrs May's remarks "hasty and irresponsible".
Mr Lugovoi, himself a suspect in the poisoning of former FSB officer Alexander Litvinenko in London in 2006, told Russian news agency Interfax: "Any chemist or physicist will tell you that in order to determine the involvement or non-involvement of a country, there must at least be some serious expert analyses carried out at a serious expert level.
"When such statements are made within a few days (of the incident), the only thing this shows is the irresponsibility of the person who makes them. It may also indicate that to find the truth is not the aim."
Who are the victims?Who are the victims?
Colonel Skripal is a retired Russian military intelligence officer who was convicted of passing the identities of Russian intelligence agents working undercover in Europe to the UK's Secret Intelligence Service, MI6.Colonel Skripal is a retired Russian military intelligence officer who was convicted of passing the identities of Russian intelligence agents working undercover in Europe to the UK's Secret Intelligence Service, MI6.
He was jailed for 13 years by Russia in 2006.He was jailed for 13 years by Russia in 2006.
In July 2010, he was one of four prisoners released by Moscow in exchange for 10 Russian spies arrested by the FBI as part of a swap. He was later flown to the UK.In July 2010, he was one of four prisoners released by Moscow in exchange for 10 Russian spies arrested by the FBI as part of a swap. He was later flown to the UK.
According to BBC Newsnight's diplomatic editor Mark Urban, in recent years Mr Skripal gave lectures at military academies offering insights into Russia's foreign military intelligence agency, the GRU.According to BBC Newsnight's diplomatic editor Mark Urban, in recent years Mr Skripal gave lectures at military academies offering insights into Russia's foreign military intelligence agency, the GRU.
A friend from college, Vladimir Svyatski, described Mr Skripal as "very active, with a positive attitude and creative".A friend from college, Vladimir Svyatski, described Mr Skripal as "very active, with a positive attitude and creative".
A former colleague, Oleg Ivanov, told the BBC he was "the life and soul of party".A former colleague, Oleg Ivanov, told the BBC he was "the life and soul of party".
His daughter, Yulia, would regularly travel to the UK from her home in Moscow to visit her father, relatives told the BBC.His daughter, Yulia, would regularly travel to the UK from her home in Moscow to visit her father, relatives told the BBC.
"She told me she liked everything [in the UK]," childhood friend Irina Petrova said. "They had an amazing place, and amazing house.""She told me she liked everything [in the UK]," childhood friend Irina Petrova said. "They had an amazing place, and amazing house."
She had an "excellent" relationship with her father, Ms Petrova said, and had been the "perfect kid", getting excellent grades at school.She had an "excellent" relationship with her father, Ms Petrova said, and had been the "perfect kid", getting excellent grades at school.
Ms Skripal, who friends say worked for multinationals including Nike and PepsiCo, was "always smiling, just like her mother", Ms Petrova added.Ms Skripal, who friends say worked for multinationals including Nike and PepsiCo, was "always smiling, just like her mother", Ms Petrova added.
What else do we know about the family?What else do we know about the family?
Mr Skripal's wife, Liudmila, died in 2012 after suffering from cancer. His elder brother and son have died in the past two years.Mr Skripal's wife, Liudmila, died in 2012 after suffering from cancer. His elder brother and son have died in the past two years.
Some of the deaths, the family believe, were in suspicious circumstances.Some of the deaths, the family believe, were in suspicious circumstances.
His son, Alexander Skripal, died aged 43 last July in St Petersburg from liver failure. He is buried in Salisbury, close to his mother.His son, Alexander Skripal, died aged 43 last July in St Petersburg from liver failure. He is buried in Salisbury, close to his mother.
Mr Skripal's family deny that he worked for MI6, and believe that the espionage case was fabricated by Russia.Mr Skripal's family deny that he worked for MI6, and believe that the espionage case was fabricated by Russia.
How has the government responded?
The government is holding regular meetings of Cobra - its emergency committee meeting.
After one on Saturday, Home Secretary Amber Rudd said it was still too early to say who was responsible for the attack but "enormous resources" were going into identifying them.
What has Russia said?
Russia has dismissed suggestions linking Moscow to the incident.
The country's foreign minister, Sergei Lavrov, said Russia was willing to help with the investigation but had not yet been asked to by the UK.
Kremlin spokesman Dmitry Peskov called Mr Skripal's illness a "tragic situation" but said "we don't have any information" - and added that Moscow was open to co-operating with British police if requested.
In a statement, the Russian embassy in London said: "Media reports create an impression of a planned operation by the Russian special services, which is completely untrue."
Has this happened in the UK before?Has this happened in the UK before?
The possibility of an unknown substance being involved has drawn comparisons with the 2006 poisoning of Alexander Litvinenko.The possibility of an unknown substance being involved has drawn comparisons with the 2006 poisoning of Alexander Litvinenko.
The former Russian intelligence officer died in London after drinking tea laced with a radioactive substance.The former Russian intelligence officer died in London after drinking tea laced with a radioactive substance.
A public inquiry concluded that his killing had probably been carried out with the approval of the Russian President, Vladimir Putin.A public inquiry concluded that his killing had probably been carried out with the approval of the Russian President, Vladimir Putin.
An investigation by Buzzfeed News claims that there have been at least 14 deaths in the UK that US officials suspected were connected to Russia.An investigation by Buzzfeed News claims that there have been at least 14 deaths in the UK that US officials suspected were connected to Russia.
Do you have any information to share on this story? Email haveyoursay@bbc.co.uk.Do you have any information to share on this story? Email haveyoursay@bbc.co.uk.
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