Frustration and hope: Biafra 50 years on

Nigeria on Tuesday marks 50 years since the declaration of an independent Republic of Biafra plunged the country into a civil war, amid renewed tensions and fresh calls for a separate state.The main pro-independence groups -- the Indigenous People of Biafra (IPOB), and the Movement for the Actualisation of the Sovereign State of Biafra (MASSOB) -- have called for a day of reflection.