The United Nations has revealed that at least 100,000 people have fled Sudan since heavy fighting broke out between rival forces on 15 April.
UN officials warned of a full-blown catastrophe if fighting does not end, adding that a further 334,000 people have been displaced within Sudan.
Fighting is continuing in the capital, Khartoum, between the army and the paramilitary Rapid Support Forces, despite a ceasefire due to be in force.
On Monday, the UN special envoy to Sudan, Volker Perthes, said the two sides had agreed to enter into talks to negotiate a stable and reliable ceasefire.