we're joined by one of the members of that team of reporters kristen graham. kristen, first, congratulations. >> thank you very much. >> brown: set the scene for us a little bit. how did you and your colleagues first get on to this story? we decided to do the story after an incident at a philadelphia high school in december of 2009 when a group of asian immigrant students were severely beaten. it was a racially motivated beating. the school district response was very luke warm at first. advocates throughout the city were saying how could this happen? we decided we were going to devote resources into looking into a pervasive culture of violence in the philadelphia school district. >> brown: tell us a little bit about that means? wht kind of violences are we talking about? the ages of the students. what were you seeing? >> in some cases students even as young as elementary school even kinder gartners were committing violent acts. in high school, one particularly disturbing case there was a group of students who went from room to room looking for their victim. th