More unidentified drones have been spotted flying over US Air Force bases in the UK. Overnight, a number of unmanned aerial vehicles were seen over RAF Lakenheath and RAF Mildenhall, in Suffolk, and RAF Feltwell in Norfolk.

It comes after a number of drones were also spotted over the same airbases between Wednesday and Friday of last week, raising security concerns. The RAF is understood to be working to help check the airspace and ensure the safety of the sites.

“I can confirm the situation is ongoing and our units continue to monitor the airspace and are working with host-nation authorities and mission partners to ensure the safety of base personnel, facilities, and assets,” the US Air Forces in Europe spokesperson said.

“To safeguard operational security, we do not discuss specific force protection measures, however we retain the right to protect our installations.”

This is a breaking news story and will be updated.