A senior US Army soldier has been arrested in the United Kingdom on suspicion of spying for Russia, British counter-terror police announced.

The 41-year-old serviceman was taken into custody near Gloucester on Tuesday. Counter Terrorism Policing London stated the arrest was made under sections one and three of the National Security Act 2023, which pertain to obtaining or disclosing protected information and assisting a foreign intelligence service, respectively.

Officers are currently conducting searches at two locations in Gloucestershire as part of the ongoing investigation. The BBC has learned the soldier was based at Imjin Barracks in Innsworth, Gloucestershire. These barracks serve as the headquarters for NATO's Allied Rapid Reaction Corps (ARRC), a significant operational base for the military alliance.

FBI Director Kash Patel issued a statement calling the arrest significant, involving allegations of espionage that are of "utmost concern" to the United States and its allies. He emphasized the FBI's intolerance for actions that endanger national security and that of partner nations.

Deputy Assistant Commissioner Vicki Evans of Counter Terrorism Policing London described the arrest as significant, noting the seriousness of the allegations and that the investigation is actively continuing. The soldier remains in custody at a London police station, detained under the National Security Act 2023, which permits detention without charge for up to 14 days.

Brigadier General Sean Stinchon, commanding general of US Army Counterintelligence Command, commented that the alleged conduct of a senior soldier entrusted with sensitive information serves as a "sobering reminder" that insider threats are "real and persistent." He urged individuals to report any suspicious activity to their local counterintelligence office.

Counter Terrorism Policing confirmed that this investigation is not linked to any other ongoing inquiries. The arrest highlights the persistent threat of espionage and the importance of vigilance from both military personnel and intelligence agencies.

Further details regarding the specific nature of the protected information allegedly disclosed or the extent of assistance provided to Russian intelligence are expected to emerge as the investigation progresses. The case underscores the complex counterintelligence challenges faced by NATO allies in safeguarding sensitive military operations and information.