An aviation enthusiast has described strange lights and unusual fighter jet flights at the US Air Force’s biggest site in the UK amid reports of widespread drone activity. The YouTuber, who has been live-streaming from outside RAF Lakenheath in Suffolk over the past week,

Small, unmanned craft were seen flying over four bases in England, the U.S. Air Force in Europe said. The Pentagon said that there had not been “any significant mission impact.”

Since the first small unmanned aerial system was first spotted on Nov. 20, the number of drones has fluctuated and there have been a range of different sizes and configurations, said the U.S. Air Forces in Europe spokesperson.

The British military has increased security around four air bases in the country that are used by U.S. forces after "a number" of drones were spotted near them.