45 Boko Haram members have been jailed between three and 31 years by a Federal High Court sitting in Kainji, Niger State.
468 suspected members of the terrorist group, Boko Haram were however freed.
The jailed men were among the 575 suspected Boko Haram members arraigned under the first phase of the mass trial of the suspects.
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According to the Minister of Information and Culture, Alhaji Lai Mohammed, the Kainji court also struck out 34 cases while 28 suspects were remanded for trial in Abuja and Minna.
He said the court ordered that the 468 discharged persons should undergo deradicalisation and rehabilitation programmes before they were handed over to their respective state governments.
The trial commenced with the formal remand by the court of 1,669 suspects for a period of 90 days, with the court ordering that they be arraigned within the specified period or released unconditionally.
The court adjourned the trial of other suspects to January 2018.