More than hundred people are dead and many more are still missing after a dam collapsed at an iron ore mine in Brazil. The rupture released a sea of contaminated muddy sludge sliding towards the town of Brumadinho. The mud buried the dam site's cafeteria, before engulfing nearby houses, vehicles and roads. As hopes of finding anyone alive dwindle, thoughts are now turning to how to deal with the 12 million cubic metres of toxic mud that was released. The dam was used to hold residue from the mine, which it is feared may contain harmful chemical substances.

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