In a letter to the Lagos State Police Command, the Department of State Services (DSS) requested that the 49 Yoruba Nation protesters be transferred to its custody in Abuja.
On Sunday, a senior DSS official, who asked not to be named, disclosed this.
On Friday, the suspects were arrested at Ojota in Lagos.
Police had warned people to stay away from the rally, which they said could turn violent.
Saturday Igboho, a self-acclaimed Yoruba activist, was one of the key individuals who promoted the rally, but after the DSS raided his Ibadan residence, he cancelled the event.
A few hours later, he made a U-turn and asked his supporters to attend the protest.
DSS official: “You know Igboho’s group is one of the groups that organized that rally.”. Some of his boys may be among those arrested. A broadening of the investigation by bringing those suspects to the headquarters wouldn’t be out of place.
The police and the DSS are working together, according to another official, to ensure that secessionists in any zone do not destabilize Nigeria.
He said: “The security agents would not allow any form of destabilisation in this country.”. We’re working together to ensure that those who plan to destabilise the country or to break law and order are dealt with.
The DSS spokesman, Peter Afunanya, did not respond to phone messages or messages sent to him by our correspondent seeking his comment.