British police have detained a 41-year-old US serviceman suspected of spying for Russia. The arrest took place near Gloucester in western England on Tuesday, after a joint investigation involving British and American security services, including the FBI. Officers suspect the soldier had access to sensitive information and allegedly broke the UK National Security Act by obtaining or providing protected information and helping a foreign intelligence service. Police carried out checks linked to the case by searching two properties in Gloucestershire. The man, whose identity has not been released, remains in custody in London. “Allegations are serious and our investigation continues with intense focus,” a senior Metropolitan Police spokesperson, Vicki Evans, said. The FBI director, Kash Patel, said the suspected spying has caused major concern for the United States and its allies. Investigators said the case is not connected to any other ongoing counter-terrorism matters. The investigation is continuing.