Eighty-two of the schoolgirls abducted by Boko Haram three years ago have been released.
They were among 276 girls taken from their school in Chibok in north-east Nigeria in April 2014.
The girls, most of them Christians, were forced into marriage with their Islamist captors. Some have given birth to children. It is believed that others had explosives strapped to them and were used as suicide bombers.
Boko Haram, which is affiliated with ISIS, is a fundamentalist Sunni sect opposed to the Westernisation of Nigeria. It aims to turn the country into an Islamic state.
