A Greenpeace activist takes samples from the toxic sludge flood in the village of Kolontar.
The toxic Hungarian flood was caused by the rupture of a red sludge reservoir at an alumina plant in western Hungary and has affected seven towns near Ajkai, 100 miles (160 kilometers) southwest of Budapest. This sludge, to date responsible for six missing people and 120 injured, is highly toxic and contains a mixture of heavy metals.