Dam bursts in Brazil

Debris of a house is pictured at Bento Rodrigues district, which was covered with mud after a dam owned by Vale SA and BHP Billiton Ltd burst in Mariana, Brazil, November 6, 2015. A dam holding back waste water from an iron ore mine in Brazil that is owned by Vale and BHP Billiton burst on Thursday, devastating a nearby town with mudslides and leaving officials in the remote region scrambling to assess casualties. The mining company Samarco, a joint venture between top iron ore miners Brazil's Vale and Australia's BHP, said in a statement it had not yet determined why the dam burst or the extent of the disaster at its Germano mine near the town of Mariana in Minas Gerais, southeastern Brazil. REUTERS/Ricardo Moraes

Trees are covered with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

A rescue worker touches the face of a horse as they try to save it at Bento Rodrigues district, which was covered with mud after a dam owned by Vale SA and BHP Billiton Ltd burst in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

The Bento Rodrigues district is pictured covered with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

A resident of Bento Rodrigues district argues with policemen in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

Rescue workers drive on a road blocked with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

The Bento Rodrigues district is pictured covered with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

Rescue workers pull on a rope as they try to save a horse at Bento Rodrigues district, which was covered with mud after a dam owned by Vale SA and BHP Billiton Ltd burst in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

Residents observe the Bento Rodrigues district covered with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

The Bento Rodrigues district is pictured covered with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

A family sits at a shelter for displaced people of the Bento Rodrigues district, covered with mud after a dam owned by Vale SA and BHP Billiton Ltd burst in Mariana, Brazil, November 6, 2015.REUTERS/Ricardo Moraes

A man walks following a mudslide in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

A man observes a road blocked with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

A helicopter flies over the Bento Rodrigues district, covered with mud in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

Buildings are covered in mud and debris in Bento Rodrigues district after a dam owned by Vale SA and BHP Billiton Ltd burst in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes

The Bento Rodrigues district is pictured covered with mud after a dam owned by Vale SA and BHP Billiton Ltd burst in Mariana, Brazil, November 6, 2015. REUTERS/Ricardo Moraes