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

South Sudan's government has denied earlier reports that Uganda had deployed special forces to its capital, Juba. Uganda's military chief Gen Muhoozi Kainerugaba said the soldiers had gone to the neighbouring country to help South Sudanese President Salva Kiir "secure" the city.

Tension mounts in South Sudan as power deal between President Salva Kiir and Vice President Riek Machar unravels.

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 arrests in Juba and deadly clashes around the northern town of Nasir are seen as jeopardizing 2018 peace deal that ended a five-year civil war

South Sudan, the world’s youngest country, has been repeatedly consumed by deadly feuding among politicians and militia leaders since its independence from Sudan in 2011. An estimated 400,000 people died in prolonged fighting in the oil-rich African country from 2013 to 2018.