Amnesty International calls on the United Nations to suspend the flow of arms into South Sudan.
The arms are being used repeatedly to commit war crimes and continue human rights violations and abuses said Muthoni Wanyeki Regional Director for East Africa.
He added that embargo should be a preventive measure and an essential step to consolidate lasting respect for human rights.
No country should be transferring arms to South Sudan until there are guarantees that the guns will not be used to commit violations of human rights or humanitarian law, Wanyeki said in a statement.
Amnesty International called for a comprehensive embargo on the supply, sale, transfer or transhipment of weapons, ammunition and military vehicles.
It also demands no military assistance including technical and financial, equipment maintenance and training to South Sudan.