On Monday, October 4th, a large reservoir filled with toxic red sludge in western Hungary ruptured, releasing approximately 700,000 cubic meters (185 million gallons) of stinking caustic mud, which killed many animals, at least four people, and injured over 120 - many with chemical burns. The 12-foot-high flood of sludge inundated several towns, sweeping cars off the road as it flowed into the nearby Marcal River. Emergency workers rushed to pour 1,000 tons of plaster into the Marcal River in an attempt to bind the sludge and keep it from flowing on to the Danube some 45 miles away. The red sludge in the reservoir is a byproduct of refining bauxite into alumina, which took place at an alumina plant run by the Hungarian Alumina Production and Trading Company. A criminal probe has just been opened by Hungarian authorities. A Greenpeace activist takes a sample of the toxic sludge in a town near Ajkai. Hungarian Army soldier wearing a chemical protection outfit cleans a street of Devecser. Janos Kis (left) and Tunde Erdelyi look at their home flooded by toxic mud in the town of Devecser, Hungary.