France24 reports that drones have been spotted flying over the US Embassy and various Paris landmarks. This comes just a few months after sightings of drones over nuclear power plants, the owners of which were never traced. Authorities are apparently working on methods to improve tracing drones in future.
Given their ability to record high-quality audio and video, drones could gather data useful in planning crimes, e.g. robbery, or even a terrorist attack, so it is sensible for the public and authorities to be alert to the risks. At a more mundane level, how long is it before some “warring neighbours” use them to spy on each other?
In most instances it is more likely that they are being used by scientists, photographers or other enthusiasts.