A dam burst Thursday at a mining waste site in Brazil, unleashing a deluge of thick, red toxic mud that smothered a village and killed at least 17 people.

A dam burst Thursday at a mining waste site in Brazil, unleashing a deluge of thick, red toxic mud that smothered a village and killed at least 17 people, an official said.

More than 50 more were injured in the disaster in southeastern Minas Gerais state, said Adao Severino Junior, fire chief in the city of Mariana.

The number of missing looks set to surpass 40 but this is not official yet, he added.

Television footage showed a torrent of muck several hundred meters (yards) long that had swamped houses and ripped off their roofs.

The village of Bento Rodrigues near the dam is 80 percent buried, the fire chief said. Several people are missing and more mudslides are possible, he said.

To make matters worse, the mud that spilled from the reservoir toppled electrical pylons, cutting off power. As night fell, the disaster area was in complete darkness.

Mariana mayor Duarte Junior said teams are having trouble reaching the site.

Roberto Verona, a local journalist, said the buried village had an emergency evacuation plan that may have given most people there time to escape as the mudslide rushed down on them.

The stream of mud stretched two kilometers (one mile) from the reservoir to the village.