The Sudanese army has been fighting armed groups in South Kordofan state for two weeks.
The area sits on the tense border between south Sudan and the north. It is home to the Nuba people, who say the Sudanese forces are deliberately targeting civilians.
The government in Khartoum denies the claims.
Al Jazeera's Haru Mutasa reports from Juba in Southern Sudan.
Source: Al Jazeera