The crackdown on 'flash mobs' by Philadelphia Mayor Michael Nutter has put him in the center of a debate about how black leaders should respond to violence within their own community.
Black youths have been primary participants in many 'flash robs' – thefts organized on Twitter and Facebook. Some bloggers see a racial element, but many experts disagree.
Derrion Albert was apparently caught in a brawl between two rival student groups as he walked home from Fenger High School. It’s not the city’s first such incident: In 2008, more than 30 students were killed.