Off-the-shelf drones aren't powerful enough to carry much more than a small packet of explosives or a couple of grenades. But as drones become larger, more powerful, and are able to fly for longer distances, the dangers could become greater over time, said a report by West Point.
Last year, US Homeland Security warned that drones could be used "as part of an attack." The bulletin describing the scope of potential attacks did not mention a planned attack or cite any specific intelligence, however.
The report landed just weeks after off-the-shelf drones on twooccasions breached the White House's secure perimeter.