A Nigerian court has refused bail to a separatist activist, whose arrest sparked a wave of bloody protests across the country last year. Nnamdi Kanu heads the Indigenous Peoples of Biafra -- a group which has emerged as the new face of the campaign for a separate Biafra state. He's been in custody since October 2015, facing charges of treason, operating pirate Radio Biafra and belonging to an illegal organisation. Kanu and three other suspects could face up to life in prison if convicted. The activist is pushing for a separate republic of Biafra, nearly 50 years after a previous declaration of independence sparked a civil war in Nigeria. The 1967-1970 conflict left more than a million people dead.