An Army official identified Lt. Col. Brandon Carroll Tyner as the U.S. soldier arrested earlier this week in the United Kingdom over reported assistance to Russian intelligence. FBI Director Kash Patel described the case as involving “allegations of espionage.”

Tyner, 41, remains accused rather than convicted, and British authorities are continuing their investigation. The Army disclosed his identity while providing details about his service, overseas deployments, current assignment and the agencies involved in the case.

Tyner began serving in the Army in January 2008, according to the Army official. He entered the service as a human resources officer under military occupational specialty 42H.

His deployments included tours in Afghanistan, Qatar and Iraq. At the time of his arrest, Tyner was serving at Imjin Barracks near Gloucestershire, England.

Imjin Barracks is a British Army base that hosts NATO’s Allied Rapid Reaction Corps. The arrest therefore centers on an officer stationed at a military site connected to the alliance’s rapid reaction structure.

Tyner’s arrest occurred shortly after the United States removed aircraft from British military bases. That removal was connected to an unrelated reported threat from Iran, according to the source account.

British authorities arrested Tyner under Sections 1 and 3 of the country’s 2023 National Security Act. The Army also said officials were investigating two locations in Gloucestershire as part of the continuing inquiry.

Counter Terrorism Policing London is leading the investigation. Tyner remains in custody at a London police station while authorities examine the reported espionage allegations.

“This important arrest involves allegations of espionage, which is of the utmost concern to the United States and our allies,” Patel said in a statement. His remarks put the case within the broader counterintelligence concerns facing the United States and allied countries.

Patel also said the FBI had made 167 counterintelligence and espionage arrests during the last 21 months. The director did not provide further details about those cases in the material accompanying his statement.

Brig. Gen. Sean Stinchon, the commanding general of U.S. Army Counterintelligence Command, thanked the FBI and authorities in the United Kingdom. He also urged people who observe suspicious activity to take their concerns to the appropriate officials.

“The alleged conduct of a senior soldier, entrusted with sensitive information, is a sobering reminder that insider threats are real and persistent. I encourage anyone who thinks they’ve witnessed something suspicious to report it to their local counterintelligence office,” Stinchon said in a statement.

The arrest comes during U.S. European Command’s “See Something, Do Something” campaign. That effort asks troops, family members and civilian employees to remain vigilant about their digital presence and report unusual behavior to authorities.

The campaign did not identify a specific threat. At the same time, experts have warned that Russia is increasing its use of hybrid warfare across Europe.

The Armed Conflict Location & Event Data Project, known as ACLED, addressed that activity in an October report. ACLED said Russia had increased hybrid threats across Europe in an effort to weaken the region’s support for Ukraine.

The report cited activity targeting aviation in Germany, attempts to sabotage critical infrastructure in Poland and increased drone incursions in Romania and Moldova. Those examples formed part of ACLED’s assessment of expanding Russian pressure across the region.

ACLED expects the threats to grow. Its report said Moscow would likely use cyberattacks and increase attacks against defense and transportation infrastructure, adding another warning as British and American authorities investigate the allegations surrounding Tyner.