More drones have been spotted flying over some of the region's US Air Force bases.

The US Air Force (USAF) said it was monitoring the airspace over RAF Lakenheath and RAF Mildenhall in Suffolk and RAF Feltwell in Norfolk.

It comes days after the USAF confirmed that a small number of “unmanned aerial systems” were spotted in the vicinity of and over the three bases between Wednesday and Sunday.

The sightings have all been actively followed although the US and British military have been tight-lipped over the incidents and who may be behind them.

British troops have been drafted in to help the United States Air Force find out who is responsible for drones flying over three air bases in England, sources said.

The radar systems located at RAF Feltwell The radar systems located at RAF Feltwell (Image: Newsquest) The latest set is believed to have been found flying overnight and UK authorities are working to ensure the safety of the sites.

In a statement, a spokesperson for USAF in Europe said: “We can confirm there were sightings on Monday during night-time hours and can only confirm that the number fluctuated and varied between the bases over the night.

“Since November 20, there has been no impact to residents or infrastructure and they have not been identified as hostile.

“However, they are still continuously being monitored to ensure the safety and security of the installations.”

An F-15 jet takes off from RAF Lakenheath in Suffolk An F-15 jet takes off from RAF Lakenheath in Suffolk (Image: Newsquest) A spokesman for the Ministry of Defence said: “We take threats seriously and maintain robust measures at defence sites.

“We are supporting the US Air Force response.”

The drones have caused fear to build among people in Feltwell causing local councillor Pallavi Devulapalli to call for better communication to locals.

She said: "When tensions are high around the world and there is growing anxiety, we need reassurances and communication about where they have come from."

Drone sightings can cause chaos for aircraft with Gatwick Airport famously being shut down in 2018 after several drones intruded into its airspace.

The UK's second-largest airport grounded planes affecting more than 1,000 flights and 140,000 passengers.