Four American soldiers from Fort Stewart, Georgia, have gone missing during military exercises in Lithuania, prompting a large-scale search operation. The soldiers were part of a NATO-led exercise aimed at strengthening the alliance’s presence in Eastern Europe amid rising tensions with Russia.

The 中文BBC reports that US troops have been working with Lithuanian authorities and NATO forces to launch an intensive search effort, using helicopters, drones and ground personnel.

Officials have not confirmed whether the soldiers disappearance was caused by an accident, a criminal act or an external threat, although no official distress signal has been reported.

Latest News adds, The incident comes at a time of heightened military activity near Russia borders, with NATO increasing its presence in the Baltics. The US government has said that every effort is being made to find the missing soldiers, while Lithuania has tightened security measures to prevent any potential security breaches.