Photo taken on November 5, 2015 shows flood in Bento Rodrigues, a town in the southeastern Brazilian state of Minas Gerais, after a dam at a mining waste site burst early Thursday. An iron ore tailings dam in the southeast Brazilian state of Minas Gerais collapsed Thursday, killing at least 15 people, according to local media reports. (Photo by Agencia Estado/Xinhua Press/Corbis)





Aerial view of the small town of Bento Rodrigues after a dam burst on Thursday in Minas Gerais state, Brazil, Friday, November 6, 2015. Brazilian rescuers searched feverishly Friday for possible survivors after two dams burst at an iron ore mine in a southeastern mountainous area. (Photo by Felipe Dana/AP Photo)





A rescue worker observes the destruction at the small town of Bento Rodrigues after a dam burst on Thursday, in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





A horse struggles in the mud at the small town of Bento Rodrigues after a dam burst on Thursday in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





Aerial view of the debris after a dam burst on Thursday, at the small town of Bento Rodrigues in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





A car and two dogs are seen on the roof of destroyed houses at the small town of Bento Rodrigues after a dam burst on Thursday in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





A girl runs between mattresses inside a sports arena where residents are taking refuge after being displaced by bursting dams in Mariana, Minas Gerais state, Brazil, Friday, November 6, 2015. The rupture of two dams at an iron ore mine unleashed a mix of water and mining residue on a village downhill, smothering the enclave of Bento Rodrigues. Only about 10 of the village's around 200 houses were left standing, and cars and other objects were tossed by what survivors described as an eruption of mud. The mine operator Samarco is jointly owned by the Brazilian mining company Vale and Australia's BHP Billiton. (Photo by Felipe Dana/AP Photo)





Horses struggles in the mud at the small town of Bento Rodrigues after a dam burst in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





Aerial view of the debris and mud on Thursday, at the small town of Bento Rodrigues after a dam burst in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





A dog walks in the mud at the small town of Bento Rodrigues on Friday, November 6, 2015, after a dam burst on Thursday in Minas Gerais state, Brazil. Brazilian rescuers searched feverishly Friday for possible survivors after two dams burst at an iron ore mine in a southeastern mountainous area. (Photo by Felipe Dana/AP Photo)





Aerial view of the debris after a dam burst at the small town of Bento Rodrigues in Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





A girl rests on a mattresses in a sports arena after residents were displaced by dams that burst in Mariana, Minas Gerais state, Brazil, Friday, November 6, 2015. (Photo by Felipe Dana/AP Photo)





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, south eastern Brazil. (Photo by Ricardo Moraes/Reuters)