Brazil dam toxic mud reaches Atlantic via Rio Doce estuary

A wave of toxic mud traveling down the Rio Doce river in Brazil from a collapsed dam has reached the Atlantic Ocean, amid concerns it will cause severe pollution.

The waste has traveled more than 500km (310 miles) since the dam at an iron mine collapsed two weeks ago.

Samarco, the mine owner, has tried to protect plants and animals by building barriers along the banks of the river.

Workers have dredged the river mouth to help the mud flow out to sea fast.

The contaminated mud, tested by the water management authorities, was found to contain toxic substances like mercury, arsenic, chromium and manganese at levels exceeding human consumption levels.

Samarco has insisted the sludge is harmless.

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