About 20 people have been found guilty for involvement with the terrorist Boko Haram group at closed-door trials taking place at a military facility in Kainji in Niger state.
They have been sentenced to between five and eight years in prison.
The trials started on Monday.
More than 1,600 Boko Haram suspects are to be tried in the coming weeks with a further 5,000 people after that.
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