The sources said Mr. Salkida was released on Tuesday evening by the State Security Service, more than a day after he was arrested at the airport in Abuja.
Mr. Salkida was declared wanted on August 14 alongside two others. The two turned themselves in the second day and were subsequently granted administrative bail.
Mr. Salkida was accused of aiding Boko Haram. Authorities also raised issues about the way he was sourcing video recordings from the sect.
He, however, denied the allegations when quizzed by SSS officials. He was released without conditions, Premium Times reports.