At least one person has died after a dam holding back waste water from an iron ore mine in Brazil burst, flooding nearby homes.
There are fears the death toll could rise and many people are missing.
Rivers of thick red mud surged down the valleys of the hilly area outside the old colonial city of Mariana. It engulfed cars and lorries, and destroyed homes.
Authorities in Mariana said that the dam had ruptured on Thursday afternoon and sent torrents of mud and debris into the small town of Bento Rodrigues, about 7km away.
The rescue operation has been hampered by fears of landslides, but helicopters have taken several stranded people to safety.