Uganda's military chief said Tuesday his country had deployed special forces in South Sudan's capital Juba to "secure it" as tensions between President Salva Kiir and his First Vice President Riek Machar stoke fears of a return to civil war.

Uganda has deployed an unknown number of troops to South Sudan in a bid to protect the fragile government of President Salva Kiir as a tense rivalry with his deputy threatens a return to civil war in the east African nation.

Uganda had deployed special forces in South Sudan’s capital, Juba, to ‘secure it’, said Uganda’s military chief on Tuesday, as tensions between South Sudan’s president and first vice-president stoked fears of a return to civil war.

Uganda has deployed special forces in South Sudan's capital Juba to "secure it", Uganda's military chief said on Tuesday, but South Sudan's information minister denied the presence of troops, as tensions between South Sudan's president and first vice president stoke fears of a return to war.