Abstract: A warhead for a guided missile initiated by a proximity fuse, for use against high speed high altitude targets, comprises a fragmentation casing, an outer explosive charge contained in the casing and having a detonator and an inner explosive charge radially separated from the outer charge by an empty space. The inner charge has a detonator and is so arranged that the outer charge is detonated by the shockwave travelling through the radial space. On the other hand, the inner charge does not detonate following explosion of the outer charge. The charges are so shaped that the fragments from the casing are distributed as a radially directed isotopic shower.