Dozens missing in BHP-Vale mine disaster in Brazil as rescue continues

Rescuers continue search for survivors after flooding from two collapsed dams used by mines owned by BHP Billiton and Vale swept through six villages

Rescue teams searched through mud and debris on Friday for dozens of people missing after a pair of dams collapsed at a Brazilian mine owned by two of the world's biggest iron ore producers.

Walls of water filled with mining waste cascaded downhill when the dams burst on Thursday, engulfing a nearby village in a sea of mud and flooding others far removed from the open-pit Samarco mine jointly owned by BHP Billiton and Vale.