UNITED NATIONS (AP) — Secretary-General Ban Ki-moon is urging immediate implementation of a cease-fire agreement in northern Mali and political negotiations between the government and Tuareg rebels who still control the key town of Kidal.

The U.N. chief said in a report to the U.N. Security Council circulated Friday that the resumption of hostilities last month has resulted in “an altered security landscape in the north of Mali with risks for international security.”