A new report finds U.S. authorities have been conducting drone spy missions over U.S. soil.

FOX's Rachel Sutherland reports from Washington:

A report from a government watchdog says the Pentagon has used drones to spy over American territory, but the missions have been in compliance with the law and they have been rare.

USA Today reports the missions took place between 2006 and 2015. There were fewer than 20 missions in all. The report, obtained under a Freedom of Information Act request, did not give details about the missions.

Last year, the Pentagon adopted a new policy, requiring all domestic spy drone operations to be approved by the Secretary of Defense.

Rachel Sutherland, FOX News.