justice correspondent pete w williams, and pete, why would the fbi be involved here? >> at the request of the local police, and they are called in to provide two types of assistance according to the officials. one is to go through the crime scene and reconstruct what is going on, and that is critical for the police in building a criminal case against this student, and secondly, the provide counselling for victims, a and that is another resource that the fbi has available, and so those are the two things that they are doing, and obviously a local crime and not a federal crime, and so that the fbi is there to simply provide assistan assistance. and in terms of the motive of what led to this, we have not heard anything about that, and there are no firm details that have reached the officials here about the motives, and they waiting to find out with the rest of us as is so often with the cases of violence in the school, whether it was a student who was bullied or whether something else set that person