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The nail bomb is an anti-personnel explosive device packed with nails to increase its wounding ability. The nails act as shrapnel, leading almost certainly to greater loss of life and injury in inhabited areas than the explosives alone would. The nail bomb is also a type of flechette weapon. Such weapons use bits of shrapnel to produce a large radius of destruction. Nail bombs are often used by terrorists, in particular by suicide bombers, since they cause large numbers of casualties when detonated in crowded places. Nail bombs can be detected via electromagnetic sensors and standard metal detectors. (via Freebase)