"The first clues appeared in Kenya, Uganda and what is now South Sudan. A British arms researcher surveying ammunition used by government forces and civilian militias in 2006 found Kalashnikov rifle cartridges he had not seen before. The ammunition bore no factory code, suggesting that its manufacturer hoped to avoid detection.
Within two years other researchers were finding identical cartridges circulating through the ethnic violence in Darfur. Similar ammunition then turned up in 2009 in a stadium in Conakry, Guinea, where soldiers had fired on antigovernment protesters, killing more than 150."