Conflict coltan from DR Congo's Rubaya mines is laundered through Rwanda into global tech supply chains, Global Witness finds. M23 earns US$800,000 a month.

Amazon and Sony among firms that may have sourced coltan, used in phones, from supply chains controlled by the M23 rebels, says Global Witness

Global Witness alleges Amazon, Sony, and Ericsson likely sourced coltan from M23-controlled mines in the DRC, raising questions about supply chain