The United Nations Mission in Sudan on Monday condemned “the burning and looting currently taking place by armed elements in Abyei,” a disputed oil-rich border district, and called on the government to put a stop to it, CNN said. “We are not sure yet who is responsible,” mission spokesman Kouider Zerrouk told CNN. Fighting in the district of Abyei broke out May 19 when Southern Sudanese forces attacked a U.N. Mission in Sudan convoy escorting northern Sudanese Armed Forces. Yesterday meanwhile, a southern minister in Sudan’s national government resigned, saying “war crimes” had been committed in Abyei. Luka Biong Deng said he could no longer work with the party of President Omar al-Bashir in the unity government.