A 41-year-old US Army soldier was arrested near Gloucester on suspicion of offences linked to Russia, Counter Terrorism Policing said. Police arrested the man on Tuesday as part of an investigation under the National Security Act 2023, specifically offences under Section 1 and Section 3. Searches are under way at two locations in Gloucestershire. Counter Terrorism Policing said the investigation is being run with close cooperation between UK and US authorities, alongside the US military and the FBI. Deputy Assistant Commissioner Vicki Evans said the arrest and investigation are the result of the partnership between UK and US law enforcement and national security teams, and that action will be taken against anyone suspected of criminal activity that could undermine national security. FBI Director Kash Patel said the case involves allegations of espionage and described it as of utmost concern, with the investigation ongoing. U.S. Army Counterintelligence Command said insider threats are real and persistent, and urged anyone who has witnessed suspicious activity to report it to local counterintelligence offices. The investigation remains ongoing following the arrest and searches.