Sudan rebels challenge bashir 2011 12 8

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Sudan: Rebels pose potent challenge to Bashir?

Growth of rebel groups creates arc of revolt around Khartoum regime.

South Sudan: UN troops step in to prevent ethnic violence

UN urges action to prevent large-scale attack in South Sudan's Jonglei state.

South Sudan: Jonglei violence displaces "at least 20,000"

Women and children have fled violence between rival tribes.

A herdsman from the Dinka tribe is pictured near South Sudan's central town of Rumbek on November 13, 2011. South Sudan is coping with frequent bouts of cattle banditry while across the border to the north, Sudan President Omar al-Bashir is challenged by several different rebels groups.

Tony Karumba

AFP/Getty Images