Hundreds of people are marching through the streets in Southern Sudan to mark the four-month point before an independence referendum is held.
A top Southern Sudan official, Pagan Amum, said Thursday that the south already has given many concessions to northern Sudan, including a 50-50 split of oil fields that lie in the south's territory.
Amum's comments came a day after U.S. Secretary of State Hillary Rodham Clinton said Sudan was a "ticking time bomb."
More than 2 million people died in the North-South civil war in Sudan. It ended in 2005 with the signing of a peace accord that promised the southern referendum in 2011, which could split Africa's largest country in two.