lagos nigeria air force tuesday say deploy aircraft southeast country unrest relate campaign secession escalate area formerly know biafra military presence southeast increase last weeks part operation military say part efforts crack crime kidnap secessionist agitation air force deployment mark escalation operation begin month essence deployment provide necessary air cover grind troop enhance overall operational cohesion efficiency say olatokunbo adesanya nigerian air force naf spokesman request nigerian army close air support make involvement naf inevitable add military deployment lead tension troop indigenous people biafra ipob secessionist group last week accuse soldier lay siege leader home army deny accusation curfew subsequently impose abia state residence locate army friday categorize ipob terrorist organization secessionist sentiment simmer southeast since biafra separatist rebellion plunge africa populous country civil war 1967 1970 kill around one million people nigerian air force deploy aircraft restive southeast