Op-Ed: The silencing of the African Union Commission of Inquiry on South Sudan

South Sudan's conflict is now more than a year old. The last year has witnessed a string of agreements to cease hostilities, all of which were violated days or hours after signing. Twenty percent of the population has been displaced, an untold number of people have been killed and relationships among communities are at an all-time low. The warring parties continue to pursue military victory at all costs and civilians are bearing the brunt of the conflict. It is time to begin exploring in earnest opportunities for United Nations-backed investigations and accountability mechanisms. By DAVID K. DENG.