LUANDA, Angola — First, the river turned red. Then dead fish by the ton floated up to the surface. Then thousands of people started getting sick.
Now, 12 people have died in the Democratic Republic of Congo, in what researchers have called “an unprecedented environmental and human disaster” along the Kasai River, a southern tributary of the mighty Congo River.
Researchers and officials with the Congolese government say that the cause was a toxic leak upstream, from the biggest diamond mine in Angola, run by Catoca, a joint venture owned by Endiama, the Angolan state mining company, and the Russian