FILE - In this video grab provided by the RT channel on Thursday, Sept. 13, 2018, Ruslan Boshirov, left, and Alexander Petrov attend their first public appearance in an interview with the RT channel in Moscow, Russia. The investigative group Bellingcat says it has identified one of the two suspects in the poisoning of an ex-Russian spy as a highly-decorated colonel of the Russian military intelligence agency GRU. Bellingcat said Wednesday, Sept. 26 that the suspect whose passport name was Ruslan Boshirov is in fact Col. Anatoliy Chepiga. (RT channel video via AP)

FILE - In this video grab provided by the RT channel on Thursday, Sept. 13, 2018, Ruslan Boshirov, left, and Alexander Petrov attend their first public appearance in an interview with the RT channel in Moscow, Russia. The investigative group Bellingcat says it has identified one of the two suspects in the poisoning of an ex-Russian spy as a highly-decorated colonel of the Russian military intelligence agency GRU. Bellingcat said Wednesday, Sept. 26 that the suspect whose passport name was Ruslan Boshirov is in fact Col. Anatoliy Chepiga. (RT channel video via AP)

MOSCOW (AP) — An investigative group in Britain said Wednesday that it has identified one of the two suspects in the poisoning of an ex-Russian spy in the U.K. as a highly decorated colonel in the Russian military intelligence agency GRU.

The group, Bellingcat, said the suspect, whose passport name was Ruslan Boshirov, is in fact Col. Anatoliy Chepiga, who in 2014 was awarded Russia’s highest medal, the Hero of Russia.

But beyond a photo from Chepiga’s 2003 passport file resembling Boshirov, the report didn’t contain further proof that Boshirov and Chepiga are the same person.

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Britain has charged Boshirov and another suspect, Alexander Petrov, with trying to kill Russian ex-spy Sergei Skripal and his daughter on March 4 with the Soviet-designed nerve agent Novichok in the English city of Salisbury. Britain has said the attack received approval “at a senior level of the Russian state,” an accusation Moscow has fiercely denied.

A spokeswoman for Russia’s Foreign Ministry, Maria Zakharova, rejected Bellingcat’s claim, saying on Facebook that it is part of an “information campaign” against Russia.

Bellingcat relies on social media and open sources in its investigations. The group has heavily focused on Russia, exposing its military activities in Ukraine, Syria and elsewhere.

Earlier this month, the two Russian men appeared on the state-funded RT channel, saying they visited Salisbury as tourists and had nothing to do with the Skripal poisoning. They denied the British claim that they were Russian military intelligence officers, saying they work in the nutritional supplements business.

Bellingcat said it had received tips from former Russian military officers and perused pictures of graduates of Russian military academies. They found a man resembling Boshirov in a group shot and then rummaged through leaked official databases to find personal details.

It identified the man as Chepiga, and eventually tracked down his passport file, dated 2003, with a picture bearing a strong resemblance to Boshirov.

Bellingcat said Chepiga served several stints in Chechnya, where Russian forces were fighting Islamic rebels. It said that Chepiga’s passport file recorded his service with a Russian military unit that was part of the GRU’s special forces.

The group said that Chepiga’s military school listed him among graduates bestowed with the Hero of Russia award in December 2014, adding that the data signaled that he likely received the medal for his actions in eastern Ukraine.