Teen flash mob strikes Center City

    Pedestrians and motorists outside Philadelphia city hall were stunned late this afternoon by the appearance of a crowd of rowdy young people that police are saying may be another flash mob, a group assembled on social networking websites. WHYY’s Tom MacDonald was there when police started making arrests

    Pedestrians and motorists outside Philadelphia city hall were stunned late this afternoon by the appearance of a crowd of rowdy young people that police are saying may be another flash mob,  a group assembled on social networking websites. WHYY’s Tom MacDonald was there when police started making arrests.

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