KHARTOUM, Sudan (CNN) -- (CNN) -- Fighting resumed Tuesday in a disputed oil-rich town in Sudan, threatening to reignite a calamitous civil war which ended three years ago.



Fresh fighting in Sudan over an oil-rich town has raised fears civil war could again erupt.



Fresh fighting in Sudan over an oil-rich town has raised fears civil war could again erupt.



UN Secretary General Ban Ki-moon deplored the fighting between the Sudanese military and troops with the Sudan People's Liberation Army. The SPLA fought a rebellion against the government for more than 20 years until both sides signed a peace deal in 2005.



The deal's Comprehensive Peace Agreement ended a north-south civil war that killed about 2 million people and displaced more than 4 million others.



An impasse over the boundaries of the town of Abyei is a major reason the peace agreement has not been fully implemented.



Fighting erupted in Abyei on May 13. It resumed Tuesday despite a cease-fire and has "resulted in the destruction" of the town "and the displacement of between 30,000 and 50,000 people," the secretary general said in a statement.



Don't Miss Sudanese opposition leader arrested Sudan cuts ties with Chad after attack Darfur rebels advance on Sudan capital, their leader says "If the situation is not urgently addressed, the achievements thus far of the Comprehensive Peace Agreement could be placed at serious risk," he said.



The civil war in Sudan, which started in 1983, pitted a northern government dominated by Arab Muslims against black Christians and animists in southern Sudan.



That conflict was not directly related to ongoing violence in the Darfur region of western Sudan.



Human rights groups and United Nations say the Sudanese military armed and trained Arab militias in Darfur after a rebellion erupted in 2003. They say the military and militias have engaged in widespread killing, rape and forced displacements in Darfur as they battle about rebels who have splintered into roughly a dozen groups.



One of those groups staged a daring attack this month near the Sudanese capital, Khartoum. The government said it quashed the attack.



Nearly 300,000 people have been killed and 2.5 million displaced in Darfur in the last five years, the UN says.
What were 50,000 people displaced because of> what caused the fighting? what is the reason for the fighting? What is the number of people who were displaced by fighting? What was destroyed? What raises fear of return to civil war?
the destruction" of the town an oil-rich town over an oil-rich town more than 4 million the town Fresh fighting in Sudan over an oil-rich town
question: What were 50,000 people displaced because of>, answer: the destruction" of the town | question: what caused the fighting?, answer: an oil-rich town | question: what is the reason for the fighting?, answer: over an oil-rich town | question: What is the number of people who were displaced by fighting?, answer: more than 4 million | question: What was destroyed?, answer: the town | question: What raises fear of return to civil war?, answer: Fresh fighting in Sudan over an oil-rich town