A senior US Army soldier has been arrested by UK counter-terrorism police near Gloucester over allegations linked to Russia. The 41-year-old was detained on Tuesday on suspicion of offences under the National Security Act, the Metropolitan Police said. FBI officials said the case involves allegations of espionage. Investigators carried out searches at two locations in Gloucestershire as part of the ongoing probe. Counter-terrorism police said they are working closely with the US military and the FBI. FBI director Kash Patel described the arrest as a matter of “utmost concern” to the United States and its allies. Deputy Assistant Commissioner Vicki Evans called the arrest “significant”, adding that the investigation is ongoing. Brig Gen Sean Stinchon, commanding general of US Army Counterintelligence Command, said the alleged conduct of a senior soldier with access to sensitive information is a reminder that insider threats can persist. Anyone who thinks they have seen suspicious activity was urged to report it to their local counterintelligence office. The case is still developing, with the investigation continuing and further details expected.