NDELE, Central African Republic (AP) — Armed with rocket-propelled grenades and Kalashnikov rifles, Seleka rebels who ousted Central African Republic’s president six weeks ago are solidifying their control over the country’s lucrative diamond industry and have even been selling some of the stones, witnesses here in the isolated and violent north say.

Rebels have for several years controlled some of the diamond-producing areas in the north, but with the overthrow of President Francois Bozize in March the Seleka rebel coalition now is the government, posing one of the greatest challenges in years to international efforts to stem the trade of “blood diamonds.”