Over the last few weeks, a number of drones have mysteriously been spotted over four air bases used by the US Air Force (USAF) in the UK. The unmanned aerial devices were first spotted on 20 November, over and in the vicinity of RAF Lakenheath and RAF Mildenhall, in Suffolk, RAF Feltwell in Norfolk and RAF Fairford in Gloucestershire. The unusual activity has prompted an investigation by the UK's Ministry of Defence (MoD) police. Around 60 British troops, including counter-drone specialists, have also been deployed to help defend the bases. ... "However they are still continuously being monitored to ensure...