Ceop chief on the difficulties of detecting child sex abuse

More than 400 children have been identified as victims of abuse over the past year by the UK's national centre for child protection.

The Child Exploitation and Online Protection centre (Ceop) said the children had been safeguarded or protected as a result.

But much child abuse goes unreported, according to its chief executive Peter Davies. He spoke to BBC Breakfast about the difficulties of preventing and detecting abuse.