Crowd Amasses News Today

Thats because police have been facing these flash mobs. hundreds of teenagers texting each other, posting on twitter, other social networks where they are showing up so a huge crowd amasses, then turns violent. with me, the assistant city editor with the "philadelphia daily news." describe some of the real problems when these teens arrive en masse in a certain neighborhood in the city. >> i think what happens is for the most part you have some really good kids, but within those groups you have k...