The UN Security Council authorised the International Criminal Court to investigate atrocities in Darfur in 2005.
South Sudan and Sudan are to resume negotiations over oil wealth sharing and defining their shared border.
The UNSC unanimously adopted a resolution demanding the finalisation of a jointly-run administration and police force for Abyei.
South Sudan`s independence has failed to resolve all issues with its northern neighbour Sudan.
The Sudanese government reiterated its right to respond to any aggression targeting its lands.
Sudan`s Army spokesman says that three foreigners and a South Sudanese national had military hardware and an armoured vehicle.
The AU`s Peace and Security Council on Tuesday urged Sudan and South Sudan to cease hostilities within 48 hours.
South Sudan seceded from Sudan last year after a referendum held as part of a 2005 peace deal.
Sudanese warplanes carried out air strikes on South Sudan, three days after South Sudan pulled out of a disputed oil field.
Last week, South Sudanese troops seized Heglig, which the southerners call Panthou, sending Sudanese troops fleeing.
Tensions have been rising since South Sudan split away from Sudan as an independent country in July.
Sudan`s President Omar Hassan al-Bashir has vowed to teach South Sudan a "final lesson by force".
Sudan`s Omar Hassan al-Bashir said he would retake the disputed oil-producing Heglig region.
Sudanese President Omar al-Bashir has threatened to topple the "insect" Juba government.
The Sudanese Army said late on Friday its forces were advancing on Heglig town, which it lost to South Sudan`s Army on Tuesday.
South Sudan has accused Sudan of launching air strikes on some of its major oilfields.
South Sudan has been at loggerheads with Sudan since seceding in July under a 2005 peace deal that ended decades of civil war.
Head of Petrodar Operating Company in South Sudan was expelled over allegations he conspired with Sudan to steal the south`s oil.
South Sudan took three-quarters of Sudan`s oil production but needs to sell its crude through northern export facilities.
The worker went missing on January 28 when a group belonging to the Sudan People`s Liberation Army attacked Chinese workers.
Day in Pics: 20th September
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