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 drones were spotted between Wednesday and Friday near RAF Lakenheath, RAF Mildenhall and RAF Feltwell. They were actively monitored after they were seen in the vicinity of and over the three bases, U.S. Air Forces Europe said in a statement.

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

The drones appeared at different times between Wednesday and Saturday and hovered over the Royal Air Force’s Mildenhall, Feltwell and Lakenheath 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

The U.S. Air Force announced several unmanned aerial systems were detected over three bases it has used in the United Kingdom last week. The drones, which ranged in sizes and configurations, were spotted last week between Wednesday and Friday “in the vicinity of and over” Royal Air Force Lakenheath,

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

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,

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.