The Department of State Services (DSS) has released journalist and activist, Chido Onumah, who was arrested at the Abuja airport on Sunday.
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Onumah told P.M. NEWS that he was released about 10pm at the headquarters of the secret organisation.
He said he was interrogated over his book We are all Biafrans, which he launched three years ago and especially why he wears a T-shirt with the title of the book on it.
He also said he was accused of being part of a plot to cause disaffection in the country.
The interrogation began at the airport before he was taken to the DSS headquarters.