A 60-strong force of British troops has been drafted in to investigate mystery drones being flown over US airbases in Suffolk, sparking a security threat.

Fears have been voiced that drones being flown over the region's US air bases could pose a threat as British troops are drafted in to help the US military identify who is responsible. 

Suffolk County Councillor Lance Stanbury believes the ongoing activity at RAF Lakenheath, RAF Mildenhall and RAF Feltwell in Norfolk is "concerning". 

But a spokesperson for the United States Air Force in Europe said the drones have not been identified as hostile. 

More activity near to the bases was reported overnight on Monday, with incidents having been reportedly taking place since Wednesday, November 20. 

It comes as 60 British troops have been called in to help with the investigation, according to the PA News Agency.

Lance Stanbury, who represents Mildenhall at Suffolk County CouncilLance Stanbury, who represents Mildenhall at Suffolk County Council (Image: Suffolk County Council) A spokesperson for the US military said on Tuesday: “We can confirm there were sightings yesterday 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.”

UK authorities are working to ensure the safety of the sites.

Drone activity has been reported at three bases in the regionDrone activity has been reported at three bases in the region (Image: Mike Page) Mr Stanbury, who represents Mildenhall at Suffolk County Council, said: "Reports of drones buzzing Mildenhall Air Base is concerning.

"If the drones are controlled by hostile forces, such as Russa, then this would be an extension of the regular testing that Russia puts our navy and air force through, but this time on mainland.

"I think it's a desperate attempt which will fail to weaken the resolve of our armed forces and those of our allies and will never succeed."

A Ministry of Defence spokesperson said it takes "threat seriously and maintain robust measures at defence sites."

“We are supporting the US Air Force response," the spokesperson added.