The U.S. has presented a draft resolution to the U.N. Security Council warning Sudan and South Sudan of sanctions if they do not implement an African Union, AU, peace plan to end fighting along their border.

The AU wants the Security Council to back its peace plan, passed earlier this week that calls for the two Sudans to settle their disputes over, citizen oilship and boundary issues within 90 days.

The Security Council has called for an immediate end to fighting along the border, which in recent weeks, has threatened to erupt into an all-out war between the former civil war foes.

Earlier this week, South Sudanese forces withdrew from the disputed oil town of Heglig, which they had earlier seized from Sudanese troops.

Sudan is accused of carrying out an increasing number of bombings in South Sudan, which leaders in Juba say amounts to a declaration of war.