Brazil halts work at Vale mine with hundreds missing after dam burst

Firefighters focused their hopes on a bus, a train, mining offices and nearby homes that were buried on Friday when a torrent of mud was unleashed by the dam break at Vale's Corrego do Feijao facility in Minas Gerais state.During a press conference, Zema said the mining complex had all its permits in order and it was unclear what caused the collapse of the dam, which had been inactive for years.The National Mining Agency ordered Vale, the largest producer of iron ore in the world, to halt operat