. >> for more i'm joined by dr boyce watkins, a founder of black world coalition and a scholar in resident at syracuse. and dr willie gordon, a psychologist and the author of "practical parenting", we are seeing more of these attacks recently or are hearing more about them. what do you think is happening? >> well, i think teenagers have an inclination to engage in some degrees of social dooefians. there's alarm that the fad could catch fire, especially since the media is grabbing this. 18 over two years is not a big number, but it will increase because teenagers know that it is the cool thing to do. i think that what you see is - as a society and kids, they are desensitised to violence. you play a knock out, but you do it with ak-47s and attacking citizens. there's desensitiesition to violence and we are ignoring young people, it's haunting us. >> the question is we don't know how many of the attacks occurred. new york city police commissioner ray kelly said some victims don't report the attacks because no robbery was involved, and in some cases they may not know what happened. we have 18