More Nigerian girls abducted by suspected militants
6 May 2014 Last updated at 19:11 BST
The United States and Britain have condemned the abduction of more than 230 Nigerian schoolgirls by the Islamist group, Boko Haram, three weeks ago.
Their comments came as the leader of the group threatened to "sell" the girls seized from their school on 14 April.
Meanwhile, police have said that eight more girls between the ages of 12 and 15 were kidnapped in north eastern Nigeria on Sunday night.
Gordon Corera reports.