United Nations, Jan. 12 -- Increasing hostilities in the oil-rich city of Derna are becoming an increasing source of concern said the UN Humanitarian Coordinator for Libya, following an intensification in fighting which has resulted in "substantial civilian casualties". "I am deeply concerned by the escalation of hostilities in the eastern city of Derna and the consequent further deterioration of the humanitarian situation in parts of the city," said Maria Ribeiro. ISIL, or Da'esh, terrorist fighters took over Derna in 2014, leading to a succession of battles for control of the city, involving the Shura Council of Mujahideen, a coalition of pro-sharia law Islamist militants, the Libyan national army and local militias. In addition to substa...