* Protest movement demands independent Biafra
* Group leader's arrest prompts anger in southeast
* New challenge for President Buhari
ENUGU, Nigeria, Nov 30
Nearly half a century after a civil war in which a million people died, 27-year-old Okoli Ikedi is part of a new protest movement (Indigenous People of Biafra, IPOB) in southeastern Nigeria calling for an independent state of Biafra.
