This summer, a child sex abuse scandal shocked people in Pakistan and beyond. It emerged that hundreds of children from Punjab province had been sexually abused, filmed, and the videos used to blackmail their families. Activists say this case is not an exception but just the tip of the iceberg. Our correspondents Taha Siddiqi and Claire Debuyser have been to meet victims to find out why the problem is so widespread, and what is being done to counter it.