More than 150 soldiers died in fighting between South Sudan's army and former rebels in the capital Juba last evening, a spokesman for the former rebels said on Saturday.
"The number of casualties is over 150 killed," said Roman Nyarji, a spokesman for rebel leader turned Vice-President Riek Machar, adding the combined death toll may rise further.
"We are expecting a bigger number of casualties because the two units of the presidential guard were all engaged yesterday," he said referring to bodyguard units of Machar and his rival President Salva Kiir.
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The shooting began when Kiir and Machar met at the presidential palace and initially involved their bodyguards.
The shootout, lasting about half an hour, quickly escalated from small-arms fire to heavier weapons and spread with machine-gun and artillery heard in several parts of Juba before subsiding after nightfall.
Kiir and Machar described yesterday's violence as "unfortunate".
By this morning a tense calm had fallen over the city with a heavy security presence but few civilians on the streets.