The Air Force didn’t identify who was behind the incursions, but said officials determined there was no impact on residents or critical infrastructure.

A number of unidentified drones have been spotted over three United States Air Force bases in England over the last six days, U.S. officials said on Tuesday. "Small unmanned aerial systems were spotted in the vicinity of and over RAF Lakenheath,

The U.S. Air Force announced several unmanned aerial systems were detected over three bases it has used in the United Kingdom last week. The drones, which ranged in sizes and configurations, were spotted last week between Wednesday and Friday “in the vicinity of and over” Royal Air Force Lakenheath,