Thousands of children have been held in recent years by Nigeria's military in "degrading and inhuman conditions" for alleged association with the Boko Haram armed group, Human Rights Watch (HRW) has said, calling for their "immediate" release.

The HRW says children have been forced to stay in squalid conditions and not allowed to see family members.

The military denies the accusations.

Al Jazeera's Ahmed Idris reports from Maiduguri.

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