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.

Unidentified drones have been spotted over U.S. bases in the U.K. used by American forces for a week, Fox News has confirmed.

A British government official says a criminal investigation is underway after drones were spotted recently by the U.S. Air Force over English military bases

A comprehensive look at how the situation, which an anonymous U.S. official said appears to be coordinated and not the work of hobbyists, has unfolded so

RAF Brize Norton has asked people to keep an eye out for drones as suspicious activity is reported around USAF bases across the UK.

The Air Force didn’t identify who was behind the incursions, but said officials determined there was no impact on residents or critical infrastructure.

The British military has increased security around four air bases in the country that are used by U.S. forces after "a number" of drones were spotted near them.

RAF Brize Norton has asked people to report it if they see a drone as suspicious activity is reported around USAF bases across the UK.

Unidentified drones have been spotted flying over four bases used by the United States Air Force in Britain, prompting the British government to call in military staff to help protect the sites. The U.

LONDON - A criminal investigation has been launched after the U.S. Air Force reported that drones were spotted flying over English military bases, a British official said Wednesday. The U.S. Air Force reported several incursions occurred in the past week at four bases where the American forces operate.