Why does this happen?

There are many reasons children are being accused of witchcraft in Nigeria. Often it’s because of a misfortune in the family, such as a break down of a marriage or a relative’s death or illness. 

All problems in life are believed to have a spiritual origin. In the last ten years, these are generally seen as the fault of child 'witches'. It's thought that the child has been put under a spell and given the power to wreak havoc. This is a belief that cuts across all tiers of society.