Flooding has killed 36 people in a region north of Sudan's capital Khartoum.
US President Barack Obama warned Sunday that Africa could only fulfill its rising potential with leaders who serve their people, not tyrants who enrich themselves.
Rebels battling government forces in two southern states in Sudan are holding up relief and medical supplies into areas they control.
War and other crises drove one person from their home every 4.1 seconds in 2012.
The United States said Monday an order by Sudanese President Omar al-Bashir to shut down an oil pipeline carrying South Sudanese crude was "deeply disappointing".
Sudan on Sunday put on hold nine security and economic pacts with South Sudan, including on vital oil shipments, but said Khartoum remained committed to good relations if Juba ended support for rebels.
The United States on Thursday accused Iran of sponsoring "terrorism" at a level unseen in decades and said that the separate threat from Al-Qaeda has been significantly degraded.
Fear and anger on Sunday followed a Sudanese rebel strike on a major town residents said had been left unguarded and was hit during coordinated attacks in the insurgents' most audacious act in years.
South Sudanese oil will be shipped again from Sudan by the end of May, official media said on Saturday, after a shutdown of more than a year which cost both impoverished nations billions of dollars.
Muslim and western nations on Friday overcame deep divisions to agree a historic United Nations declaration setting out a code of conduct for combatting violence against women.
Sudan breached UN sanctions by using warplanes and rockets bought from Belarus and Russia in the Darfur conflict, according to UN experts who have called for a tightened embargo.
The United States on Tuesday marked 10 years of war in Darfur, warning that without political talks the Sudan region may face another decade of the devastating conflict.
The United States on Thursday called on Sudan to hold "unconditional" talks with rebels battling government forces in two strife-torn states where the UN says thousands are close to starvation.
The rival presidents of Sudan and South Sudan met for face-to-face talks Saturday to push forward stalled security, oil and border deals, and discuss the fate of the contested Abyei region.
Four Sudanese have been sentenced to life in prison for killing a Chinese worker in oil-producing South Kordofan, state-linked media reported on Monday.
US intelligence has established that Yasser Abbas worked with Devincci Hourani to pursue deals in Sudan for Caratube International Oil Company.
Six people were injured on Sunday as Sudanese police clashed with hundreds of protesters showing support for four dead students originally from the conflict-plagued Darfur region.
Two Iranian warships docked in Port Sudan on Saturday, a witness said, marking the second port call by the Iranian navy in Sudan in five weeks.
Sudan's powerful intelligence service on Thursday said it had disrupted a "plot" to disturb the country's security, as a witness saw tanks moving in the streets of the capital.
Calls for change by Arab Spring-inspired reformers in Sudan will likely be ignored when thousands of government-linked Islamists begin meeting on Thursday.
- Middle East & Africa
- Barack Obama
- Nelson Mandela
- South Africa
- United States
- United Nations
- South Sudan
- Rakhat Aliyev