A 41-year-old American military officer was arrested in England on suspicion of espionage after being linked to an attempt to steal protected information connected to a NATO installation, police said. The suspect was detained on Tuesday near Gloucester, in the south west of England, with the NATO alliance confirming he served in its NATO Rapid Deployable Corps (NRDC) in the UK. British anti-terror officers arrested him in close cooperation with US authorities, according to the police. Police said the man was arrested under UK national security laws dealing with the disclosure of protected information and providing assistance to a foreign intelligence service, naming Russia as the country involved. Officers carried out searches at two locations in Gloucestershire, and the suspect is being held at a police station in London. NATO said the arrest related to the suspect’s service with the alliance, and it described the NRDC based in the UK as NATO’s largest base in the country, with more than 400 permanent staff from 20 member nations. The investigation is being led by Britain’s anti-terrorism unit. A senior FBI official said the case involves espionage charges, adding that the FBI has “no tolerance” for anyone who betrays the oath to the United States and endangers national security. Police said the case is ongoing and the charges are serious.