abuja nigerian minister accuse government political opponents sponsor campaign secession part southeast nigeria formerly know biafra unrest rise secessionist sentiment simmer southeast since biafra separatist rebellion plunge africa populous country civil war 1967-70 kill estimate one million people campaigners indigenous people biafra ipob intensify call secession since leader nnamdi kanu release bail april detain nearly two years charge criminal conspiracy belong illegal society military friday label ipob terrorist organization week accuse surround kanu home southeastern abia state deny curfew impose state lai mohammed information minister say late sunday ipob set tool destabilize nation sponsor people call coalition politically disgruntle treasury looters believe sponsor group destabilize country trigger chaos realize ambition escape justice free dip hand nation treasury say accuse people group name minister also say kanu previously publicly support nigeria unity president muhammadu buhari predecessor goodluck jonathan power buhari administration form progressives congress apc party take office may 2015. opposition people democratic party pdp rule 16 years prior buhari come power number former government officials face corruption charge deny since buhari take office pdp accuse president mount witch-hunt members biafra separatists sponsor nigerian government 's opponents minister