On this edition of Africa 54: clashes between herdsman and fisherman in northern Cameroon have sent refugees, most of them women and children, fleeing into neighboring Chad; 75 children who were kidnapped from their school in Nigeria's northwestern Zamfara State have been released after their abductors came under pressure from a military crackdown; And heavily armed gunmen raided a jail in south-central Nigeria, blowing up the perimeter fence and freeing 266 inmates.