Advancing anti-government fighters in eastern Democratic Republic of Congo forced the temporary closure of the world's third most productive tin mine, its operator said in a statement received by AFP Friday.

Tin prices extended gains to hit the highest in more than two years, as a halt to production at a major mine in Africa that’s threatened by insurgents continues to fan this year’s biggest rally on the London Metal Exchange.

M23 fighters, backed by Rwanda, continue to advance into eastern DR Congo. While the rebels are outnumbered by the Congolese army, DW examines whether the military has the capacity to respond effectively.