Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Image copyright Facebook Image caption The couple touched a contaminated item with their hands but police have not identified the source 
  
 Police have launched a murder inquiry after a woman exposed to the nerve agent Novichok in Wiltshire died. 
  
 Dawn Sturgess, 44, died in hospital on Sunday evening after falling ill on 30 June. 
  
 Charlie Rowley, 45, who was also exposed to the nerve agent in Amesbury, remains critically ill in hospital. 
  
 Kremlin spokesman Dmitry Peskov said Russia was "deeply concerned" about the incident - but said accusations that it was involved are "absurd". 
  
 The UK government previously blamed Russia for the poisoning of former spy Sergei Skripal and his daughter Yulia with Novichok in Salisbury in March. Russian authorities denied any involvement in the poisoning. 
  
 Investigators say the possibility that the two cases are linked is a "clear line of inquiry". 
  
 Theresa May said she was "appalled and shocked" by the death of mother of three Ms Sturgess, from Durrington. 
  
 Home Secretary Sajid Javid will chair a meeting of the government's emergency committee Cobra later today. 
  
 A post-mortem examination of Ms Sturgess is due to take place and her family has been informed, police said. 
  
 The investigation is being led by detectives from the Counter-Terrorism Policing Network and about 100 detectives are working on the case alongside Wiltshire Police. 
  
 Officers are still trying to work out how Ms Sturgess and Mr Rowley were exposed to the nerve agent - although tests have confirmed they touched a contaminated item with their hands. 
  
 Assistant Commissioner Neil Basu, the head of UK Counter-Terrorism policing, said: "This is shocking and tragic news. Dawn leaves behind her family, including three children, and our thoughts and prayers are with them at this extremely difficult time. 
  
 "The 45-year-old man who fell ill with Dawn remains critically ill in hospital and our thoughts are with him and his family as well." 
  
 Mr Basu said the death "has only served to strengthen our resolve to identify and bring to justice the person or persons responsible for what I can only describe as an outrageous, reckless and barbaric act". 
  
 He said: "Detectives will continue with their painstaking and meticulous work to gather all the available evidence so that we can understand how two citizens came to be exposed with such a deadly substance that tragically cost Dawn her life." 
  
 Media playback is unsupported on your device Media caption Footage shows Ms Sturgess in Salisbury days before her collapse 
  
 Dr Christine Blanshard, medical director at Salisbury District Hospital, where Ms Sturgess died, said it was "desperately sad" and she expressed condolences to her family. 
  
 She said: "The staff here at Salisbury District Hospital worked tirelessly to save Dawn. Our staff are talented, dedicated and professional and I know today they will be hurting too. 
  
 "They did everything they could." 
  
 Mr Rowley is also being treated at the hospital. 
  
 A police officer who was tested for Novichok poisoning was given the all clear. 
  
 'Murderers' 
  
 Mrs May sent her "thoughts and condolences" and said officials were "working urgently to establish the facts". 
  
 She said: "The government is committed to providing full support to the local community as it deals with this tragedy." 
  
 British diplomat Julian King, the European Commissioner responsible for the EU's security union, said: "Those behind this are murderers." 
  
 Home Secretary Sajid Javid said: "This desperately sad news only strengthens our resolve to find out exactly what has happened." 
  
 Labour leader Jeremy Corbyn said he was "shocked", adding: "A full and thorough police investigation must now establish the facts, provide support to the local community and bring those responsible to justice." 
  
 Image copyright Getty Images Image caption The couple collapsed at a flat on Muggleton Road in Amesbury on 30 June 
  
 Public Health England said the risk to the general public "remains low". 
  
 Professor Paul Cosford said: "As a precaution we still advise the public not to pick up any strange items such as needles, syringes or unusual containers." 
  
 He also said people in five locations between 22:00 BST on 29 June and 18:30 on 30 June should continue to follow advice, namely: "Wash your clothes in a washing machine and to keep your items double-bagged and securely fastened, if they are dry-clean only." 
  
 Those locations are Muggleton Road, Boots pharmacy and the Baptist church in Amesbury, and John Baker House and Queen Elizabeth Gardens in Salisbury. 
  
 Baroness Scott, the leader of Wiltshire Council, said the residents of John Baker House - the hostel where Ms Sturgess lives - have been rehoused and are being given support. 
  
 'Unwilling victim' 
  
 Angus Macpherson, Wiltshire police and crime commissioner, said he was "horrified and appalled". 
  
 He said: "Ms Sturgess was an innocent member of the public who should have been able to go about her daily life without becoming an unwilling victim in such an unprecedented, international, incident." 
  
 Analysis 
  
 By BBC security correspondent Frank Gardner 
  
 The working hypothesis is that the pair became contaminated after touching a poison container left over from the March attack on Sergei and Yulia Skripal. 
  
 The death of Dawn Sturgess, a British citizen on British soil, now changes the investigation to a murder inquiry, with all the diplomatic and security ramifications that carries. 
  
 Britain has been blaming Moscow for the original attack in March, saying there is no plausible alternative to the Kremlin having ordered the assassination attempt. 
  
 Russia has denied any involvement, suggesting instead this was the action of a weak British government looking to undermine the success of the current World Cup being hosted by Russia. 
  
 The next few days are likely to see further accusations and counter-accusations. 
  
 The poisoning of the Skripals, both of whom spent weeks in hospital before being discharged, was blamed by the UK government on Russia. 
  
 Russian authorities denied any involvement. 
  
 Mr Skripal, 66, is a Russian former double agent. He was accused by Russia of spying for Britain's MI6 and jailed in 2006. He was later pardoned and allowed to settle in the UK. 
  
 After the hospitalisation of Ms Sturgess and Mr Rowley, Mr Javid accused the Russian state of using Britain as a "dumping ground for poison". 
  
 The Russian Embassy hit back, accusing the government of trying to "muddy the waters" and "frighten its own citizens". 
  
 Image copyright Getty Images Image caption Yulia Skripal and her father Sergei were exposed to Novichok in Salisbury in March 
  
 Russian media has suggested alternative explanations of what happened in Amesbury, including claims the UK government staged it because it is finding the World Cup "hard to swallow" or to disrupt the Russia-US summit on 16 July. 
  
 According to BBC Monitoring, other theories in the media include the claim that Porton Down or a former employee of the research lab are to blame, or the Amesbury couple poisoned themselves. 
  
 In a statement, the Met Police said the possibility the poisoning of the Skripals and Ms Sturgess and Mr Rowley are linked is a "clear line of inquiry". 
  
 A spokesman said the investigators are "not in a position to say whether the nerve agent was from the same batch that the Skripals were exposed to". 
  
 He also said: "There is no evidence that (Ms Sturgess and Mr Rowley) visited any of the sites that were decontaminated following the attempted murders of Sergei and Yulia Skripal in March." ||||| Police launch murder inquiry after death of Dawn Sturgess, who was taken ill last weekend 
  
 A woman who was exposed to the nerve agent novichok in Amesbury, Wiltshire, has died in hospital. 
  
 The Metropolitan police have launched a murder investigation after Dawn Sturgess, 44, from Durrington, died on Sunday after handling an item contaminated with the nerve agent on 30 June. 
  
 Her partner Charlie Rowley, 45, who was also taken ill after being exposed to the nerve agent, remains in a critical condition in hospital. 
  
 Wiltshire poisoning: what we know so far Read more 
  
 The investigation into the poisonings is being led by detectives from the Counter Terrorism Policing Network, and about 100 detectives are working alongside officers from Wiltshire police. 
  
 Investigators are still trying to determine how the couple were exposed to the nerve agent after emergency services were called to a residential address in Amesbury eight days ago after Sturgess collapsed. 
  
 Later the same day, an ambulance was called back to the address after Rowley fell ill. 
  
 Following Sturgess’s death, assistant commissioner Neil Basu, head of UK counter-terrorism policing, said on Sunday night: “This is shocking and tragic news. Dawn leaves behind her family, including three children, and our thoughts and prayers are with them at this extremely difficult time. 
  
 “The 45-year-old man who fell ill with Dawn remains critically ill in hospital and our thoughts are with him and his family as well. 
  
 “This terrible news has only served to strengthen our resolve to identify and bring to justice the person or persons responsible for what I can only describe as an outrageous, reckless and barbaric act.” 
  
  
  
 Quick guide What is novichok? Show Hide Novichok refers to a group of nerve agents developed by the Soviet Union in the 1970s and 80s to elude international restrictions on chemical weapons. Like other nerve agents, they are organophosphate compounds, but the chemicals used to make them, and their final structures, are considered classified in the UK, the US and other countries. The most potent of the novichok substances are considered to be more lethal than VX, the most deadly of the familiar nerve agents, which include sarin, tabun and soman. While the novichok agents work in a similar way, by massively over-stimulating muscles and glands, one chemical weapons expert said the agents did not degrade fast in the environment and had 'an additional toxicity that was not well understood. Treatment for novichok exposure would be the same as for other nerve agents, namely with atropine, diazepam and potentially drugs called oximes. The chemical structures of novichok agents were made public in 2008 by Vil Mirzayanov, a former Russian scientist living in the US, but the structures have never been publicly confirmed. It is thought they can be made in different forms, including as a dust aerosol. The novichoks are known as binary agents because they only become lethal after mixing two otherwise harmless components. According to Mirzayanov, they are 10 to 100 times more toxic than conventional nerve agents. While laboratories that are used to police chemical weapons incidents have databases of nerve agents, few outside Russia are believed to have full details of the novichok compounds and the chemicals needed to make them. Photograph: Matt Cardy/Getty Images Europe 
  
 On Saturday, a police officer who attended hospital over concerns he may have been exposed to novichok was given the all-clear. 
  
 Counter-terrorism officers are still investigating the attempted murders of former Russian spy Sergei Skripal and his daughter, Yulia, who were poisoned in March. 
  
 Responding to the death, Theresa May said: “I am appalled and shocked by the death of Dawn Sturgess, and my thoughts and condolences go to her family and loved ones. 
  
 “Police and security officials are working urgently to establish the facts of this incident, which is now being investigated as a murder. 
  
 “The government is committed to providing full support to the local community as it deals with this tragedy.” 
  
 Home secretary Sajid Javid said he is “determined to bring the killers to justice” following the death of Dawn Sturgess, and Labour leader Jeremy Corbyn called for a “full and thorough police investigation” to “establish the facts” and “bring those responsible to justice”. 
  
 Play Video 0:29 CCTV footage shows Dawn Sturgess day before poisoning - video 
  
 Dr Christine Blanshard, from Salisbury district hospital – where Sturgess was treated, described her death as “desperately sad” and sent her condolences to the family. 
  
 “The staff here at Salisbury district hospital worked tirelessly to save Dawn,” she said. “Our staff are talented, dedicated and professional and I know today they will be hurting too. They did everything they could.” 
  
 A postmortem will be scheduled to take place in due course. 
  
 Prior to the news of the death, home secretary Sajid Javid had said there were no plans to impose fresh sanctions on Russia following the latest nerve agent poisoning. 
  
  
  
 During a visit to Salisbury on Sunday to meet residents caught up in the nerve agent poisoning, he said: “We don’t want to jump to conclusions. Clearly, what we have already determined, what our expert scientists have determined, is that the nerve agent in this incident is the exact same nerve agent as was used back in March. 
  
 “We know back in March that it was the Russians. We know it was a barbaric, inhuman act by the Russian state. Again, for this particular incident, we need to learn more and let the police do their work.” 
  
 Following the latest poisonings, Public Health England said the risk to the public remains low, but advised against picking up strange items like needles, syringes and unusual containers. 
  
 The Russian embassy in London had not responded to a request for comment at the time of writing, but had previously accused the British government of trying to “muddy the waters” and “frighten its own citizens” since the poisoning of Rowley and Sturgess. 
  
 The Porton Down laboratory near Salisbury confirmed on Wednesday that the victims had been exposed to novichok. |||||
Output:
The latest Novichok case in England is now a murder investigation. Dawn Sturgess, one of two people exposed to the same nerve agent that nearly killed Russian citizens Sergei Skripal and Yulia Skripal earlier this year, died late Sunday at the hospital in Salisbury where she had been treated since falling ill June 30, the Guardian reports. Britain's Prime Minister Theresa May said she was "appalled and shocked" by the death of the 44-year-old. Neil Basu, chief of the UK's counter-terror police, said Sunday night that the death "has only served to strengthen our resolve to identify and bring to justice the person or persons responsible for what I can only describe as an outrageous, reckless, and barbaric act." Basu said Sturgess leaves behind her family, including three children, and Charlie Rowley, the "45-year-old man who fell ill with Dawn, remains critically ill in hospital." Sturgess and Rowley lived 10 miles from Salisbury and fell ill after spending time in the city. BBC correspondent Frank Gardner reports that police believe they were exposed to the poison when they encountered a container left over from the attack on the Skripals, which the UK has blamed on Russia. The death of Sturgess, a British citizen, "now changes the investigation to a murder inquiry, with all the diplomatic and security ramifications that carries," he writes. Russia has rejected the accusations, claiming that the UK is blaming Moscow for the nerve agent to undermine the success of the World Cup that Russia is hosting.