bth: there is every reason to think this will be part of a long trend. Hezbollah has been using drones to drop grenades in Syria against rebels for months. So to see ISIS using it as well is no surprise. It is only a matter of time before drones are also used as a means of political assassination. Small low flying and quick drones are going to be very difficult to defend against. Laser tools for blinding, GPS spoofing and netting are obvious short term solutions, but that will not be enough.