The 41-year-old soldier was arrested near Gloucester on suspicion of violating two national security laws. The offences include obtaining or disclosing classified information and assisting a foreign intelligence service.
“The allegations are serious and our investigation is ongoing,” said Vicki Evans of the British counter-terrorism police, describing the arrest as “significant”.
The soldier is said to be a senior officer with access to classified material.
British police say their counter-terrorism unit is working closely with the US Federal Bureau of Investigation and the US military.
FBI Director Kash Patel called the arrest “significant” in dealing with espionage allegations that are of “the utmost importance” to the US and its allies, he said in a statement, adding:
“The FBI has zero tolerance for anyone who breaks their promise to the US and whose actions endanger the national security of the US and our partners.”
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