The army in South Sudan has said that 127 people died during clashes between civilians and soldiers.
The clashes erupted during a disarmament exercise, according to army spokesman Maj-Gen Lul Ruai Koang.
The fighting according to officials occurred in the central town of Tonj in Warrap State erupted after soldiers tried to disarm civilians involved in cattle raiding and communal clashes.
Koang said among the dead were 46 security personnel and 82 civilians and lasted over two days.
South Sudan this year got a national government running. It was formed after a deal to end a conflict that broke out in 2013.
The disarmament exercise in Tonj county, according to the government was to ensure that armed militias in the area could not drive inter-communal violence.
South Sudan gained independence in 2011, shortly after, fighting broke out for two years when President Kiir sacked his then deputy Machar.
The breakdown in relations between two sparked the civil war which was only brought to an end with a deal this year.
That war led to the death of hundreds of people and displaced millions.