Sudanese President Omar al-Bashir on Saturday ordered a halt to the flow of oil from South Sudan, less than two months after southern crude began moving again, official radio said.

"Bashir ordered the minister of oil to stop the flow of South Sudanese oil from tomorrow, Sunday," Radio Omdurman reported in an SMS message which gave no further details.

Sudan's opposition alliance announced on Saturday a 100-day plan for the peaceful overthrow of President Omar al-Bashir, who has been in power for more than two decades.

"I expect the regime will fall before the 100 days finish," said Farouk Abu Issa, who represents more than 20 opposition parties.

Two Sudanese air force crew died on Thursday when their helicopter crashed in war-torn Blue Nile state, the army said, a week after another chopper went down in conflict-plagued South Kordofan.

The incident happened near the airport outside Ed Damazin, the capital of Blue Nile state, said army spokesman Sawarmi Khaled Saad.

At least 38 people died in Sudan Tuesday in one of the country's worst road accidents in years when a bus collided with a truck, police said, blaming the accident on speeding.

"Because of a crash this morning between a bus and a truck south of El Gutaina town in White Nile state, 38 people died and others were injured," a police statement said.

An aide to Egyptian President Mohammed Morsi has apologized after she failed to inform politicians holding talks with the president that they were live on air, allowing viewers to watch them cook up plans to sabotage a dam in Ethiopia.

"Due to the importance of the topic it was decided at the last minute to air the meeting live. I forgot to inform the participants about the changes," presidential aide for political affairs Pakinam El-Sharkawi said.

Renewed fighting between two rival Arab tribes in Sudan's Darfur region over access to pasture has killed 64 people, police said in a statement late on Wednesday.

Dozens more were wounded in the fighting between the Beni Halba and Gemir tribes, South Darfur police said.

The U.N. Security Council on Wednesday voted to add more than 1,100 extra troops to the international peacekeeping force in Abyei amid new tensions between Sudan and South Sudan over the territory.

The move comes after the killing of a tribal leader and an Ethiopian peacekeeper in the past month.

South Sudan said Tuesday it is committed to peace deals signed with its former foe Sudan, a day after Sudanese President Omar al-Bashir threatened to cut oil pipelines after accusing Juba of backing rebels.

Juba denies that it supports the rebels but Khartoum's renewed accusations threaten to derail a series of key deals to normalize relations between the former civil war foes.

African leaders will pass a resolution Monday urging the International Criminal Court to refer back to Kenya the crimes against humanity cases against the country's top leaders, a senior African Union official said.

"We will be approving this morning what the ministers have proposed, definitely," AU security commissioner Ramtane Lamamra told Agence France Presse, referring to a draft agreed Friday by foreign ministers.

Fierce fighting has erupted between Sudanese government troops and rebels near Kadugli, the capital of South Kordofan, with both sides giving contradictory figures of casualties.

Sunday's clashes pitched government troops against fighters from the Sudan Revolutionary Front (SRF), a coalition of three rebel groups, in the Dandur area 15 kilometers (nine miles) from Kadugli, Sudanese army spokesman Colonel Sawarmi Khaled Saad told Agence France Presse.