An elaborate publicity stunt by a Swedish mobile phone company involving a faked meteorite strike in a Latvian meadow has provided a new case study on how a marketing campaign can backfire. Metz said Tuesday that IEDs are “much more primitive in Afghanistan” because they use “less military munitions and more homemade explosives.” But he said that although the military has been able to disarm many IEDs, the big challenge going forward is detecting devices using tiny wires.