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.

The leadership of the United People’s Alliance (UPA) has condemned the decision by the Government of South Sudan to invite the Uganda People’s Defence Forces (UPDF) to South Sudan amid tensions and conflicts in Upper Nile, Western Bhar Ghazal and Western Equatoria states.