Unknown forces attempted to assassinate Venezuelan President Nicolás Maduro last Saturday in Caracas. The weapon of choice: a pair of powerful M600 quadcopters, each armed with more than two pounds of C4 explosive, and equipped with remote-control detonators.

The incident marked the first time unmanned aerial vehicles (UAVs) have been used to target a head of state. But experts say that weaponized drones are becoming increasingly common—and that it’s only a matter of time before it happens again.

Yep. Imagine a drone that unleashes a chemical or biological agent. DARPA is spending huge amounts of money trying to figure out how to combat this emerging threat. Serious biz. To read more, click here.