Why is violence burning with a rich mineral?

The rebels supported by Rwanda seize the huge area of ​​the Democratic Republic of Congo. The anti -government forces known as the M23 protect the ethnic groups, a minority group slaughtered in Genocide in 1994. However, experts say that the real reason is the rare mineral of the Congo, which is moving mobile phones and devices. Ruth McLean, New York Times West Africa, explains how Rwanda's rebel and their sponsors have gained a profit.