UPDATE 1-Samarco sensors gave warnings well before Brazil damburst -Globo
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RIO DE JANEIRO, Jan 25 (Reuters) - Brazilian iron ore miner Samarco Mineração SA received serious danger warnings from ground sensors in 2014 and 2015, months before a deadly and environmentally destructive burst of a tailings dam, Globo TV's Fantastico newsmagazine said on Sunday.