The State Security Service (SSS), self-styled as the Department of State Services (DSS), is a security agency of Nigeria and one of three successor organisations to the National Security Organization (NSO). The agency is under the Presidency of the Federal Republic of Nigeria, and it reports its activities to the office of the NSA. It is headquartered in Abuja. According to the 1998 Presidential Proclamation, the SSS operates as a department within the Ministry of Defence and its under the control of the National Security Adviser.