Operatives of the Department of State Services (DSS) have reportedly stormed the office of the Socio-Economic Rights and Accountability Project (SERAP).
The unexpected invasion took place on Monday afternoon.
The reasons behind the operation cannot be ascertained at at the time of filing this report.
The DSS also arrested the president of the Nigerian Labour Congress (NLC), Joe Ajaero at the Nnamdi Azikiwe Airport, Abuja.