A 41-year-old U.S. Army member was arrested near Gloucester, England, on Tuesday on suspicion of espionage for Russia, according to the Metropolitan Police.
Authorities searched two locations in Gloucestershire as part of the investigation. The man was held at a London police station Tuesday evening.
Deputy Assistant Commissioner Vicki Evans, Senior National Coordinator for Counter Terrorism Policing, called it a "significant arrest" resulting from close collaboration between British and U.S. authorities. U.S. military and FBI officials were closely involved in the investigation, police said.
The Gloucester area hosts multiple U.S. military and intelligence facilities, including Fairford air base.