U.S. troops in Europe reported a swarm of unidentified drones flying over several Air Force bases in the U.K. in the past week, a sighting that comes amid a growing mystery of UFO sightings near military installations.

US officials are monitoring drone sightings near three bases in England. 60 British personnel are aiding the investigation.

It is not ruled out that Russia may be behind it. The sightings began when London authorized Ukraine to use ballistic missiles on Russian soil. Sixty electronic warfare specialists from the Royal Air Force (RAF) have been sent to the American bases on British soil due to the suspicious presence of drones near the military facilities since last week.

Unidentified drones have been spotted again over three British air bases used by the U.S. Air Force, officials confirmed Tuesday. The three bases are all located within the same area of eastern England between Cambridge and Norwich,

Unidentified drones are still being spotted over United States Air Force (USAF) bases in England on Wednesday, a USAF spokesperson said, confirming that a fourth base had also been targeted by the week-long airspace incursions.

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

The Pentagon is “actively” watching for drones over U.S. Air Force locations in the United Kingdom, following a series of unexplained sightings over the past two weeks. The sightings, which took

Mysterious drones have been spotted flying near US Navy Bases in the UK - shortly after appliances were seen tailing a Royal Navy aircraft carrier.

A number of unidentified drones have been spotted over three United States Air Force bases in England over the last six days, U.S. officials said on Tuesday. "Small unmanned aerial systems were spotted in the vicinity of and over RAF Lakenheath,

US Air Force in UK says a small number of drones spotted flying over bases in eastern England.