19 others treated after nerve agent attack on Russian ex-spy Sergei Skripal, his daughter

A police sergeant who assisted a former Russian spy and his daughter after a nerve agent attack in Britain is receiving medical treatment, as well as 18 other people who may have been exposed to the poison, police said Thursday.

The attack on Sergei Skripal, 66, and his daughter, Yulia, 33, is being treated as attempted murder, authorities have said. The two remain hospitalized in critical condition after being found unconscious Sunday on a bench near a shopping mall in Salisbury, 90 miles west of London.

Sgt. Nick Bailey, an officer from the Wiltshire police who assisted the two victims, also remained hospitalized on Thursday but appeared to be making progress, said Kier Pritchard, the acting Wiltshire police chief.

"Of course he's very anxious, very concerned," Pritchard told reporters.

Some of those who were treated after the nerve agent attack received blood tests, support and hospital advice, Pritchard said. He would not say whether the other victims were other officers, medical workers or bystanders.

At a news conference, Britain's home secretary, Amber Rudd, described Bailey as "still seriously unwell," but "engaging and awake and talking to point."

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The case of Sergei Skripal's poisoning
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The case of Sergei Skripal's poisoning
SALISBURY, ENGLAND - MARCH 08: Forensic police officers wearing hazmat suits examine a vehicle believed to belong to Sergei Skripal on March 8, 2018 in Salisbury, England. Police investigations continue into the use of a nerve agent to poison Sergei Skripal, who was found ill in a Salisbury park with his daughter on March 4. Both Sergei Skripal and his daughter remain in critical condition in hospital. Sergei Skripal was granted refuge in the UK following a spy swap between the US and Russia in 2010. (Photo by Rufus Cox/Getty Images)
Chairs are seen on tables inside the Mill pub which former Russian inteligence officer Sergei Skripal and his daughter Yulia visited before they were found poisoned on a bench nearby in Salisbury, Britain, March 11, 2018. REUTERS/Henry Nicholls
SALISBURY, ENGLAND - MARCH 06: Witness Freya Church, 27, walks with a policeman near a forensic tent where Sergei Skripal, 66 and his duaghter Yulia Skripal, in her 30s, were found unconscious in Salisbury town centre two days previously on March 6, 2018 in Salisbury, England. Sergei Skripal who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010 and his daughter remain critically ill after being exposed to an 'unknown substance'. (Photo by Dan Kitwood/Getty Images)
Londoners pass-by the London newspaper Evening Standard's latest headline about ex-Russian spy Sergei Skripal's suspected poisoning by Russia in southern England, on 6th March 2018, in the capital's financial district, the City of London, England. As both Skripal and a woman believed to be his daughter Ylulia remain in a critical condition at Salisbury hospital where he was taken ill on Sunday 4th, British Counter Terrorism Police have taken over the investigation from the local Wiltshire force. The British press have been quick in blaming President Putin's involvement just weeks before his Presidential re-election. (Photo by Richard Baker In Pictures via getty Images)
Former Russian military intelligence colonel Sergei Skripal attends a hearing at the Moscow District Military Court in Moscow on August 9, 2006. Sergei Skripal, a former Russian double agent whose mysterious collapse in England sparked concerns of a possible poisoning by Moscow, has been living in Britain since a high-profile spy swap in 2010. Police were probing his exposure to an unknown substance, which left him unconscious on a bench in the city of Salisbury and saw media draw parallels to the case of Alexander Litvinenko, an ex-spy who died of radioactive polonium poisoning in 2006. / AFP PHOTO / Kommersant Photo / Yuri SENATOROV / Russia OUT (Photo credit should read YURI SENATOROV/AFP/Getty Images)
A forensics tent covers the bench, where Sergei Skripal and his daughter Yulia were found slumped, in a cordoned off area in the centre of Salisbury, Britain, March 7, 2018. REUTERS/Toby Melville
Police officers seal off the road on which Russian Sergei Skripal and his daughter have been staying in Salisbury, Britain, March 7, 2018. REUTERS/Toby Melville
Police officers stand on duty outside a restaurant which has been secured as part of the investigation into the poisoning of former Russian inteligence agent Sergei Skripal and his daughter Yulia, in Salisbury, Britain March 11, 2018. REUTERS/Henry Nicholls
SALISBURY, ENGLAND - MARCH 07: Assistant Commissioner Mark Rowley (R) and Chief Medical Officer Dame Sally Davies give a statement on March 7, 2018 in Salisbury, England. Sergei Skripal, who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010, and his daughter remain critically ill after being exposed to an 'unknown substance'. A police officer who was the first to attend the scene is now also in a serious condition in hospital. Police are treating the suspected poisoning as attempted murder by nerve agent. (Photo by Chris J Ratcliffe/Getty Images)
Police officers stand on duty outside a pub which has been secured as part of the investigation into the poisoning of former Russian intelligence agent Sergei Skripal and his daughter Yulia, in Salisbury, Britain March 12, 2018. REUTERS/ Henry Nicholls
SALISBURY, ENGLAND - MARCH 07: Assistant Commissioner Mark Rowley leaves after giving a statement on March 7, 2018 in Salisbury, England. Sergei Skripal, who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010, and his daughter remain critically ill after being exposed to an 'unknown substance'. A police officer who was the first to attend the scene is now also in a serious condition in hospital. Police are treating the suspected poisoning as attempted murder by nerve agent. (Photo by Chris J Ratcliffe/Getty Images)
SALISBURY, ENGLAND - MARCH 08: Forensic police officers wearing hazmat suits examine a vehicle believed to belong to Sergei Skripal on March 8, 2018 in Salisbury, England. Police investigations continue into the use of a nerve agent to poison Sergei Skripal, who was found ill in a Salisbury park with his daughter on March 4. Both Sergei Skripal and his daughter remain in critical condition in hospital. Sergei Skripal was granted refuge in the UK following a spy swap between the US and Russia in 2010. (Photo by Rufus Cox/Getty Images)
SALISBURY, ENGLAND - MARCH 07: Assistant Commissioner Mark Rowley (R) and Chief Medical Officer Dame Sally Davies give a statement on March 7, 2018 in Salisbury, England. Sergei Skripal, who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010, and his daughter remain critically ill after being exposed to an 'unknown substance'. A police officer who was the first to attend the scene is now also in a serious condition in hospital. Police are treating the suspected poisoning as attempted murder by nerve agent. (Photo by Chris J Ratcliffe/Getty Images)
Police officers stand on duty outside a pub which has been secured as part of the investigation into the poisoning of former Russian intelligence agent Sergei Skripal and his daughter Yulia, in Salisbury, Britain March 12, 2018. REUTERS/ Henry Nicholls
Londoners pass-by the London newspaper Evening Standard's latest headline about ex-Russian spy Sergei Skripal's suspected poisoning by Russia in southern England, on 6th March 2018, in the capital's financial district, the City of London, England. As both Skripal and a woman believed to be his daughter Ylulia remain in a critical condition at Salisbury hospital where he was taken ill on Sunday 4th, British Counter Terrorism Police have taken over the investigation from the local Wiltshire force. The British press have been quick in blaming President Putin's involvement just weeks before his Presidential re-election. (Photo by Richard Baker In Pictures via getty Images)
SALISBURY, ENGLAND - MARCH 07: A police tent is seen behind a cordon outside The Maltings shopping centre where a man and a woman were found critically ill on a bench on March 4 and taken to hospital sparking a major incident, on March 7, 2018 in Wiltshire, England. Sergei Skripal, who was granted refuge in the UK following a 'spy swap' between the US and Russia in 2010, and his daughter remain critically ill after being exposed to an 'unknown substance'. (Photo by Matt Cardy/Getty Images)
Former Russian military intelligence colonel Sergei Skripal attends a hearing at the Moscow District Military Court in Moscow on August 9, 2006. Sergei Skripal, a former Russian double agent whose mysterious collapse in England sparked concerns of a possible poisoning by Moscow, has been living in Britain since a high-profile spy swap in 2010. Police were probing his exposure to an unknown substance, which left him unconscious on a bench in the city of Salisbury and saw media draw parallels to the case of Alexander Litvinenko, an ex-spy who died of radioactive polonium poisoning in 2006. / AFP PHOTO / Kommersant Photo / Yuri SENATOROV / Russia OUT (Photo credit should read YURI SENATOROV/AFP/Getty Images)
A tent covers the park bench where former Russian intelligence agent Sergei Skripal and his daughter Yulia were found after they were poisoned, in Salisbury, Britain March 12, 2018. REUTERS/Henry Nicholls
A tent covers the park bench where former Russian intelligence agent Sergei Skripal and his daughter Yulia were found after they were poisoned, in Salisbury, Britain March 12, 2018. REUTERS/Henry Nicholls
A police officer stands at a cordon around the bench where former Russian inteligence agent Sergei Skripal and his daughter Yulia were found after they were poisoned, in Salisbury, Britain March 11, 2018. REUTERS/Henry Nicholls
Britain's Home Secretary Amber Rudd, accompanied by Temporary Chief Constable Kier Pritchard, visits the scene where Sergei Skripal and his daughter Yulia were found after having been poisoned by a nerve agent in Salisbury, Britain, March 9, 2018. REUTERS/Peter Nicholls
A police officer stands on duty outside a restaurant which has been secured as part of the investigation into the poisoning of former Russian inteligence agent Sergei Skripal and his daughter Yulia, in Salisbury, March 11, 2018. REUTERS/Henry Nicholls
Police officers work at a supermarket near the bench where former Russian intelligence officer Sergei Skripal and his daughter Yulia were found poisoned, in Salisbury, Britain, March 12, 2018. REUTERS/Henry Nicholls
MOSCOW, RUSSIA - MARCH 6, 2018: Pictured in this file image dated August 9, 2006, is retired colonel Sergei Skripal during a hearing at the Moscow District Court. File image/Press Office of Moscow District Military Court/TASS (Photo by TASS\TASS via Getty Images)
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Police have not offered any specifics about the attack, including the type of nerve agent used or how it was delivered.

Skripal, a former military intelligence officer, was sentenced to 13 years in prison in 2006 after being convicted in Russia of spying for Britain.

He passed the identity of dozens of spies to the United Kingdom's MI6 foreign intelligence agency, according to news reports. He was freed in 2010 as part of a U.S.-Russian spy swap that also included Anna Chapman, who was arrested in New York earlier that year.

The incident has drawn parallels to the death of former Russian agent Alexander Litvinenko, who was poisoned with radioactive polonium 11 years ago in London.

Litvinenko, 43, an outspoken critic of Russian President Vladimir Putin, fled Russia for Britain six years before he was poisoned. He died after drinking green tea laced with the rare and very potent radioactive isotope at London’s Millennium Hotel.

In a report published in 2016, a British judge found that Litvinenko was killed in an assassination carried out by Russia's security services — with the probable approval of Putin. Russia has denied any responsibility for Litvinenko's death.

There is no evidence of any Kremlin connection in Skripal's case. But intelligence analyst Glenmore Trenear-Harvey, who formerly worked for MI6, told NBC News that he believes that the case has the hallmarks of Putin's involvement.

Yuliya Talmazan and Michele Neubert contributed reporting from London, and Keir Simmons and Nick Bailey from Salisbury, England.

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