If you thought the 12-gauge shotgun-wielding AutoCopter was bad news, imagine one of the little menaces in the hands of a terrorist and strapped with several pounds of explosives -- or worse, biological, chemical, or radiological payloads. Several experts are warning that we are nearly defenseless against such attacks, even though terrorists have already shown a propensity for using such tactics in the Middle East and South America, and are known to have purchased so-called "drone" airplanes capable of high-precision navigation even over long distances. One scenario that is particularly disturbing involves a fleet of drones or robotic helicopters launched from an off-shore freighter, sent en masse to attack a large gathering like a sporting event where stampeding from panic would likely cause more deaths than the bombs themselves. The Pentagon is supposedly working on an drone-killing drone of its own, called Peregrine, that would patrol the skies and intercept any hostile aircraft -- but the main problem seems to be finding, not destroying these things, and you'd need a whole lot of Peregrines to cover every potential target in the US.
[Via Phys Org]