Mediators from the African Union have adjourned peace talks between the Sudanese government and two rebel groups, after failing to persuade Khartoum to agree to a security agreement designed to stop the violence in Sudan's western Darfur region.
Negotiators will try to form a new schedule for the discussions, which have been taking place in Abuja, Nigeria. It is not clear when the talks will start again.
Rebels accepted the proposed agreement, which calls for no-fly zones over the Darfur. But Khartoum rejected it, saying it favors anti-government forces.
Mediators say both sides remain stalled over proposals to disarm pro-government Arab militias, known as the Janjaweed, blamed for committing atrocities against black villagers.
In other developments, Britain has introduced a new U.N. Security Council resolution, urging Sudan's warring parties to commit to peace and threatening "further urgent action" against any group that fails to implement previous agreements.