The investigative group Bellingcat is reporting that one of the two suspects in the poisoning of an ex-spy in England is a doctor who works for Russian military intelligence.
Bellingcat has now identified "Alexander Petrov" to be in fact Dr. Alexander Yevgenyevich Mishkin, a trained military doctor in the employ of the GRU.
The British open-source website said it had identified the suspect using testimonies from people the suspect knew and a scanned copy of his passport.
Bellingcat last month identified Mr Boshirov as a colonel in the Russian military intelligence body GRU, whose real name was Anatoliy Chepiga.
Bellingcat published a scanned copy of his passport and claimed Mishkin was born in July 1979 in the village of Loyga, Arkhangelsk district of northern Russian Federation.
Suspects in Novichok poisonings say it's a fatal coincidence that they were in Salisbury.
Russian President Vladimir Putin has said that the two men shown in British surveillance footage near Skripal's home in Salisbury and identified by British authorities as Boshirov and Petrov were actually civilians on a tourist trip. Sergei Skripal and his daughter Yulia both survived the attack but a woman who later found the poison, which had been hidden in a perfume bottle, wasn't so lucky.
Britain accuses the Russian government of trying to kill Skripal in retribution for his ongoing work with European intelligence agencies.
A spokesperson for London's Metropolitan Police said they would not comment on "speculation regarding their identities".
"Until early September 2014, Mishkin's registered home address in Moscow was Khoroshevskoe Shosse 76B - the address of the headquarters of the GRU", Bellingcat's investigation concluded.
Skripal, a former GRU colonel, was convicted of treason in 2006 by a Russian court after being accused of spying for Britain.
British officials said the two were poisoned with Novichok, a military-grade chemical weapon that was developed in the Soviet Union, and blamed Putin's government for the attack.
He has served in Chechnya and Ukraine and was made a "Hero of the Russian Federation" in 2014, the website said. They said they went to the city to visit its cathedral.
Anatoliy Chepiga AKA Ruslan Boshirov and Alexander Mishkin AKA Alexander Petrov.
The prosecutors said at the time the two were undercover GRU officers.
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