Ongoing violence in central Kasai region has killed more than 3,300 people since October, according to Catholic church. Congo's government says it will cooperate with the UN inquiry [Melanie Gouby/AP] The United Nations has opened an investigation into killings in central Democratic Republic of Congo , though some Western countries and campaign groups say they had hoped it would have a stronger mandate. Congo's government has been fighting armed groups in the Kasai region since August, prompting fears of a wider conflict in the central African country, riven by ethnic rivalry and competing claims over mineral resources. Congo's Catholic Church said this week the violence had killed more than 3,300 people since October, with both government forces and the militia responsible for hundreds of deaths. On Friday, the UN's Human Rights Council (UNHRC), composed of 47 member states, adopted by consensus the resolution calling for an investigation, brought by African countries...