Three Western aid workers were released Saturday. The government denies involvement but some analysts see a broader strategy at work.
Three aid workers were kidnapped this week, while others express concern about the health of the 1.1 million Darfuris left without assistance.
But the expulsion of 13 aid groups from Sudan is more than a humanitarian crisis. It may reignite regional conflicts in the country – and beyond, say analysts.
Hassan al-Turabi had called for President Bashir to surrender to the International Criminal Court on war-crimes charges.
The arrest warrant for Sudan's president is indicative of the mounting pressure on the International Criminal Court to show results.
International aid groups fear the Sudanese government will respond by putting up more obstacles to their relief work.
Omar al-Bashir is the first sitting president to be indicted for crimes against humanity and war crimes. Critics worry the move could destabilize the country.