Members of the #BringBackOurGirls Abuja campaign group take part in discussions during a sit-in protest at the Unity Fountain in Abuja

Members of the #BringBackOurGirls Abuja campaign group attend a sit-in protest at the Unity Fountain in Abuja

Students of a secondary school arrive for a national prayer meeting to invoke for the release of the abducted schoolgirls from the remote village of Chibok, in Abuja

A member of the #BringBackOurGirls Abuja campaign group addresses a sit-in protest at the Unity Fountain in Abuja