premise: The BBC has seen documents alleging that a former rebel leader indicted for war crimes is playing a leading role in a mission involving the UN in DR Congo. The documents appear to prove that Gen Bosco Ntaganda is taking an active part in the mission's chain of command, a BBC correspondent in the country says. The UN-Congolese force is fighting Hutu rebels in the eastern DR Congo. The force says Congolese authorities have given assurances that Gen Ntaganda was not involved in joint operations.
hypothesis: Bosco Ntaganda was a rebel leader.