South Sudanese rebel troops have seized control of Jonglei state capital Bor, a spokesman has said.

Moses Ruai Lat, based in the northern state of Unity, claimed that rebel forces were now marching towards the country's capital Juba and were already "close" to the city.

But the Sudan People's Liberation Army (SPLA), which is loyal to the government, countered that its forces were advancing on Bor, which is 118 miles north of Juba, to meet rebel militias heading south.