A dam burst Thursday at a mining waste site in Brazil, killing at least 17 people and injuring more than 50, a fire chief said.
"The number of missing is going to surpass 40 but that is not official," said Adao Severino Junior, fire chief in the city of Mariana in southeastern Minas Gerais state.
The village of Bento Rodrigues near the dam is practically buried in mud, the fire chief said.
"The situation is grim. It is dark. There is a lot of mud," Severino said.
Rescue operations will continue through the night, he added.