and apparently that's the same flash mob. a and this is what you were referencing before, showing the kids kicking people in the streets, attacking other people in cars. mayor nutter could not have been more clear on this. he says in his quote you act like a knucklehead, you're going to get locked up. how is the city trying to deal with this? >> i think that the city is trying to increase enforcement of curfew. i think that they're trying to monitor some of these sites. they've involved the fbi. they're trying to hold parents accountable. they're also -- they've also assembled rapid response teams to deploy to some of these locations as soon as they hear that there has been a violent outbreak at some part of the city. >> right. and dr. fine, i know you have worked with teenagers in philadelphia. what is at the root of this behavior? what makes these peaceful gatherings turn violent? >> well, campbell, i think i do agree with yvette that the majority of these kids are