But soon, criminal gangs started to appear to fill the gap.
I met several victims of the gangs but most were too scared to go on the record.
She is in her early 30s but looks older.
Police raids rescue children As a result of the Channel 4 News report above, Colombia Virgins for Sale, several police raids have taken place in the city of Medellin to rescue children who are being sexually abused and exploited.
The mayor says sixteen children who were being held in child sex rings have been rescued and are now being cared for by child protection services.
When you are out in the city you realise why he said that.
They started literally as an office where anyone could hire a hit man.