BELO HORIZONTE, Brazil (Reuters) – The collapse of a Brazilian dam controlled by miner Vale a week ago likely happened because parts of the sand and dried-mud structure dissolved into liquid, a state regulator said in an interview, similar to what caused another deadly mining disaster less than four years ago.

Rescue workers attend a mass for victims victims of a collapsed tailings dam owned by Brazilian mining company Vale SA, in Brumadinho, Brazil February

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