Air raid sirens sounded, military ordered to shelters - what happened in Great Britain at US air base

In Great Britain, drones were spotted over a US military air base, after which an air raid alert was announced, Sky News reports. According to the broadcaster, American military personnel stationed at RAF Lakenheath air base were ordered to take shelter due to the "suspected activity of unauthorised drones". Air raid sirens could be heard at the base due to the drone activity.