The National Security Organization (NSO) of Nigeria was established in 1976 by the military regime of Olusegun Obasanjo, after the failed Dimka coup--which claimed the life of former Head of State Murtala Mohammed. The NSO was given a mandate of coordinating both domestic and foreign intelligence.
Following the 1985 military coup that brought Ibrahim Babangida to power, the NSO was dissolved into three separate divisions per the provisions made in Decree 19:
- State Security Service (SSS) - Responsible for domestic intelligence
- Nigerian Intelligence Agency (NIA) - Responsible for Foreign intelligence and counterintelligence operations
- Defence Intelligence Agency (DIA) - Responsible for military intelligence.