Clashes between the Sudanese Liberation Army, Darfur's largest rebel group, and Khartoum's military have escalated over the last two weeks.
It came as Sudan's government accused the SLA of breaching a peace deal by providing support to southern Sudan.
Hoda Abdel-Hamid reports from Zam Zam, the largest refugee camp in northern Darfur - where many say they feel trapped between rebel forces and the Sudanese army.