Brazil's slow-motion environmental catastrophe unfolds

Toxic mudslide from collapse of dams spreads as BHP Billiton fined $66m

Nine people are now confirmed dead, and a further 19 remain unaccounted for as a slow-motion environmental catastrophe continues to unfold following the collapse of two mining dams in Brazil's mineral-rich state of Minas Gerais.

Eight days after the town of Bento Rodrigues was swept away by 50m cubic metres of toxic mud, a slow-moving tide of toxic iron-ore residue is oozing downriver, polluting the water supply of hundreds of thousands of residents as it makes its way to the ocean.