ANFO stands for Ammonium Nitrate / Fuel Oil, and describes a crude but effective explosive that is used by farmers to clear stumps.
Its formulation is well known. Ammonium nitrate is a substance most commonly used as a fertilizer. When mixed with diesel fuel it can be used as an improvised low yield explosive. Commercial explosives based on ANFO are also available.
Because of the easy availability of its ingredients, ANFO is often used by terrorists for large bombs. ANFO was often used by the Provisional IRA in its bombing campaigns and Palestinian extremist groups.
So called "fertilizer bombs" were made famous in America by their use in the Oklahoma City bombing which maimed and killed hundreds of victims.
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