Fighting between rival Arab tribes in Sudan's Darfur region has killed 100 people, state radio said on Saturday. "The number of casualties has grown to 100" after battles between the Misseriya and Salamat tribes, Radio Omdurman said in a brief bulletin sent by SMS. The dispatch did not say what time period its toll covered, but intense battles between the two groups have flared again this month in southwestern Darfur. Radio Omdurman said fighting had stopped but a Misseriya leader told Agence France Presse battles continued on Saturday around Umm Dukhun town, with more than 50 killed on both sides.