About 60 British troops have been brought in to help find those responsible for flying drones near US military bases.
The personnel have been sent to assist the US Air Force (USAF) in its investigation, the understands.
The drones were not considered hostile, the USAF said, adding the sightings had “fluctuated and varied between the bases” and had “ranged in sizes and configurations”.
The Ministry of Defence (MoD) stated: “We are supporting the US Air Force response.”