South Sudan accused Sudan of continuing to carry out airstrikes on its territory despite a call by the United Nations Security Council to end hostilities, dpa cited a report as saying Friday. The Sudan Tribune newspaper quoted the South's army spokesman Philip Aguer as saying that Sudanese fighter jets dropped six bombs in Unity State on Thursday. On Wednesday, the Security Council threatened sanctions against both countries if hostilities do not cease by the weekend. The African Union (AU) is spearheading efforts to bring the sides back to the negotiating table, amid fears of an all-out war. Juba and Khartoum have both said they would accept an AU proposal to help resolve outstanding issues, including their poorly demarcated border. Sudan's Foreign Ministry said in a statement that Khartoum's "strategic goal" is to reach a "durable peace" with its southern neighbour. The border region has seen fighting in several hotspots since the middle of last year. In early April, fighting over the Heglig oil fields turned into the worst battles since South Sudan became an independent nation in July.