The national Directorate of Nationality and Passport and Immigration launched the registration exercise for citizens in Yei River State.
Director of Nationality Passport and Immigration in South Sudan Lieutenant Colonel Thon Bol Agok urges citizens not to bring foreigners to have the certificate.
He calls on the chiefs to help identifying the right persons to get the document.
Any mistake done of giving the nationality to non-south Sudanese cheats citizens, Lieutenant Colonel Bol points out.
The director spoke during the launch of the program on Monday in Yei.