Ammonium Nitrate Explosion

In 1921, 450 tons of Ammonium Nitrate exploded at a chemical plant in Germany, killing 561 people. The plant had been using dynamite to break up the stockpile for years, believing it was Ammonium Nitrate Sulphate. Only 1 other NH4NO3 accident had more casualties - Texas City, Texas, USA in 1947.