ANAL = Ammonia-Nitrate + Aluminium Powder an extremely volatile mix. So much so that the heat from rubbing two rough wooden boards together can set it off. So if you make the container and pressure plate out of wood, there's no way for a metal detector to find it, our jammers don't work because there's no RC signal, and there's no give-away like an ant trail because it's victim operated and completely self contained.
Just because a people have less access to modern technology doesn't make them any less creative. Any insurgent, whether in Libya like in the article, Iraq, Afghanistan, soon Yemen, is on equal mental footing to us.