Nigerian president asks UN to help recover schoolgirls kidnapped by Boko Haram

Nigeria's president Muhammadu Buhari has invited the United Nations to help negotiations to swap the kidnapped schoolgirls from Chibok for detained leaders of Boko Haram, a government statement said.

Mr Buhari's government has been criticised for failing to free the Chibok girls by parents of the abducted students, community leaders and human rights activists.