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Philip Ingram, a former military intelligence officer with the British Army, told the BBC that similar information "falls firmly into the bracket of what would have been classified top secret".

It came days after the Russian defence attaché was expelled from London for alleged espionage as an "undeclared military intelligence officer".

"When gathering intelligence, the Russian security and intelligence services use a wide range of resources and different platforms," the agency wrote, adding that these had been limited by expelling intelligence officers.

"When someone stands shoulder to shoulder with American troops and puts his life in danger..." one former Afghan intelligence officer told Reuters in a phone call from an ICE detention center, his voice shaking.

Digital intelligence officers have conducted extensive inquiries into her mobile phone, smart watch and running apps, but none have yielded any results, the force said.