The latest in the ever escalating battle of wits between the insurgent's ingenuity against the US military appears to be the increasing usage of "sticky" bombs. No, not those grenades from Halo.
The so-called "sticky" improvised explosive devices, or IEDs, can be quickly tucked under a car bumper, and held in place by magnets. Which means any vehicle in Iraq can now be turned into a car bomb, or an assassination tool. The driver often has no idea of the deadly modifications to his vehicle. Which makes stopping the bombs that much tougher.
Read more here.