The secret mass trial of suspected Boko Haram members commenced today at the Kainji detention facility in Niger State.
The trial with begin with 1,670 people and would be presided over by four judges.
The behind closed doors trial, is the biggest legal investigation into the 8-year militant Islamist insurgency.
According to the ministry of justice, after the Kainji trials are completed, a further 651 people suspected of having links to Boko Haram and currently being held at prisons in Maiduguri, the capital of the northeastern state of Borno, would go on trial.
Boko Haram have killed about 20,000 Nigerians and rendering over 2 million homeless.