An elderly woman from South Kordofan is photographed shortly after arriving at a refugee registration centre in the Yida refugee camp in Unity State, South Sudan. In recent weeks, aid agencies have reported a steep influx of new arrivals, at times exceeding 700 per day. More than 30,000 refugees currently reside in Yida having fled the war between the Republic of Sudan and rebel forces in South Kordofan. Photograph: Pete Muller/AP
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