Rastrean el misterioso químico que envenenó al espía ruso [FOTOS]

SAL3. SALISBURY (REINO UNIDO), 08/03/2018.- Bomberos son llamados a retirar objetos sospechosos en la zona en donde se produjo el intento de asesinato del exespÌa ruso Sergey Skripal y su hija Julia, en la Catedral de Salisburi, Inglaterra (Reino Unido) hoy, 8 de marzo de 2018, La ministra de Interior, Amber Rudd, ha dicho que el intento de asesinato ha sido "descarado y peligroso" y prometiÛ "actuar" una vez que se aclaren los hechos. EFE/ Gerry Penny

A police officer stands guard outside a cordoned-off branch of the Italian chain restaurant Zizzi close to The Maltings shopping centre in Salisbury, southern England, on March 8, 2018 which was closed in connection to the ongoing major incident sparked after a man and a woman were found critically ill on a bench at the shopping centre on March 4. British police raced Tuesday to identify an unknown substance that left a former Russian double agent fighting for his life, in what a senior lawmaker said bore the hallmarks of a Russian attack. Moscow said it had no information about the "tragic" collapse of the man, identified by the media as Sergei Skripal, in the quiet southern English city of Salisbury on Sunday, but said it would be happy to cooperate if requested by British authorities. Specialist officers from the counter-terrorism squad are helping investigate the incident, which also left a 33-year-old woman -- reported to be Skripal's daughter Yulia -- in a critical condition in what is feared to be a poison plot. / AFP / Ben STANSALL

Officials are helped out to take off their protective suits after repositioning the forensic tent, covering the bench where Sergei Skripal and his daughter Yulia were found, in the centre of Salisbury, Britain, March 8, 2018. REUTERS/Peter Nicholls

Members of the emergency services in green biohazard suits afix the tent over the bench where a man and a woman were found on March 4 in critical condition at The Maltings shopping centre in Salisbury, southern England, on March 8, 2018 after the tent became detached. British detectives on March 8 scrambled to find the source of the nerve agent used in the "brazen and reckless" attempted murder of a Russian former double-agent and his daughter. Sergei Skripal, 66, who moved to Britain in a 2010 spy swap, is unconscious in a critical but stable condition in hospital along with his daughter Yulia after they collapsed on a bench outside a shopping centre on Sunday. / AFP / Ben STANSALL

A still image from CCTV footage recorded on February 27, 2018 shows former Russian spy Sergei Skripal buying groceries at the Bargain Stop convenience store in Salisbury on February 27, 2018. British detectives on March 8 scrambled to find the source of the nerve agent used in the "brazen and reckless" attempted murder of a Russian former double-agent and his daughter. Sergei Skripal, 66, who moved to Britain in a 2010 spy swap, is unconscious in a critical but stable condition in hospital along with his daughter Yulia after they collapsed on a bench outside a shopping centre on Sunday. / AFP / -

A police officers stand guard outside The Mill pub close to The Maltings shopping centre in Salisbury, southern England, on March 8, 2018 which was closed in connection to the ongoing major incident sparked after a man and a woman were found critically ill on a bench at the shopping centre on March 4. British police raced Tuesday to identify an unknown substance that left a former Russian double agent fighting for his life, in what a senior lawmaker said bore the hallmarks of a Russian attack. Moscow said it had no information about the "tragic" collapse of the man, identified by the media as Sergei Skripal, in the quiet southern English city of Salisbury on Sunday, but said it would be happy to cooperate if requested by British authorities. Specialist officers from the counter-terrorism squad are helping investigate the incident, which also left a 33-year-old woman -- reported to be Skripal's daughter Yulia -- in a critical condition in what is feared to be a poison plot. / AFP / Ben STANSALL

A picture shows The Mill pub close to The Maltings shopping centre in Salisbury, southern England, on March 8, 2018 which was closed in connection to the ongoing major incident sparked after a man and a woman were found critically ill on a bench at the shopping centre on March 4. British police raced Tuesday to identify an unknown substance that left a former Russian double agent fighting for his life, in what a senior lawmaker said bore the hallmarks of a Russian attack. Moscow said it had no information about the "tragic" collapse of the man, identified by the media as Sergei Skripal, in the quiet southern English city of Salisbury on Sunday, but said it would be happy to cooperate if requested by British authorities. Specialist officers from the counter-terrorism squad are helping investigate the incident, which also left a 33-year-old woman -- reported to be Skripal's daughter Yulia -- in a critical condition in what is feared to be a poison plot. / AFP / Ben STANSALL

TOPSHOT - Members of the emergency services in green biohazard suits work to afix the tent over the bench where a man and a woman were found on March 4 in critical condition at The Maltings shopping centre in Salisbury, southern England, on March 8, 2018 after the tent became detached. British detectives on March 8 scrambled to find the source of the nerve agent used in the "brazen and reckless" attempted murder of a Russian former double-agent and his daughter. Sergei Skripal, 66, who moved to Britain in a 2010 spy swap, is unconscious in a critical but stable condition in hospital along with his daughter Yulia after they collapsed on a bench outside a shopping centre on Sunday. / AFP / Ben STANSALL