Exclusive access inside Boko Haram's stronghold in Nigeria

BBC Hausa's Jimeh Saleh was granted exclusive access to Boko Haram's stronghold in the Sambisa forest in north-eastern Nigeria.

Travelling with the Nigerian army, he went to see how far the region had come since Nigeria's President Muhammadu Buhari vowed to crush the group by the end of 2015.

Boko Haram's six-year insurgency has seen more than 17,000 people killed and over a million others displaced.