The drones were spotted between Wednesday and Friday near RAF Lakenheath, RAF Mildenhall and RAF Feltwell. They were actively monitored after they were seen in the vicinity of and over the three bases, U.S. Air Forces Europe said in a statement.

Drones over the bases in Britain ranged in size and configuration, a U.S. Air Forces in Europe spokesperson said.

Unidentified drones have been spotted flying over three bases used by the United States Air Force in Britain, the two countries have confirmed.

Unidentified drones have been spotted over three US airbases in Britain, the United States Air Force (USAF) has confirmed. The sightings between 20 and 22 November were of a number of “small unmanned aerial systems” over RAF Lakenheath and RAF Mildenhall, in Suffolk, and RAF Feltwell, in Norfolk.

The USAF, which uses the bases, said it was unclear at this stage whether the drones were considered hostile. It also declined to comment on whether any defence mechanisms were used, but said it retained "the right to protect" installations.

A mystery drone has been spotted following a British aircraft carrier at sea after unmanned aerial vehicles were seen hovering over three air bases in England.

The US Air Force has reported sightings of small drones near three key bases in eastern England that are used by American forces. Detected from Wednesday to Friday last week, these drones were noticed around RAF Lakenheath,