credible moment firefighters rescue a dog trapped in mud after Brazil mining disaster kills four and leaves 28 people missing
Dams holding mining waste burst at a Brazilian iron ore on Thursday
The 600-person Bento Rodrigues community, which sits in the heart of Brazil's iron ore belt, was hit the hardest
Mud has forced cities more than 200 miles downstream to cut off drinking water as it runs past the Rio Doce river
It is being considered one of the worst mining disasters in the country's history


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