Nail bomb

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A nail bomb is an explosive device packed with nails to increase its destructive power. The nails act as shrapnel, leading - almost certainly - to greater loss of life and injury in inhabited areas than would explosive alone.

A nail bomb is the prefered weapon of a suicide bomber since it causes large number of casualties when detonated in crowded places. However, nail bombs can be dedected via electromagnetic sensor and standart metal detectors.