By JEFFREY GETTLEMAN
The New York Times

NYALA, Sudan, Aug. 28 - Some of the same Arab tribes accused of massacring civilians in the Darfur region of Sudan are now unleashing their considerable firepower against one another in a battle over the spoils of war that is killing hundreds of people and displacing tens of thousands.

In the past several months, the Terjem and the Mahria, heavily armed Arab tribes that United Nations officials said raped and pillaged together as part of the region’s notorious janjaweed militias, have squared off in South Darfur, fighting from pickup trucks and the backs of camels. They are raiding each other’s villages, according to aid workers and the fighters themselves, and scattering Arab tribesmen into the same kinds of displacement camps that still house some of their earlier victims.

United Nations officials said that thousands of gunmen from each side, including some from hundreds of miles away, were pouring into a strategic river valley called Bulbul, while clashes between two other Arab tribes, the Habanniya and the Salamat, were intensifying farther south.

Darfur’s violence has often been characterized as government-backed Arab tribes slaughtering non-Arab tribes, but this new Arab-versus-Arab dimension seems to be a sign of the evolving complexity of the crisis. What started out four years ago in western Sudan as a rebellion and brutal counterinsurgency has cracked wide open into a fluid, chaotic, confusing free-for-all with dozens of armed groups, a spike in banditry and chronic attacks on aid workers

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