By Fran Spielman and Kim Janssen
CHICAGO — Acting Police Supt. Garry McCarthy vowed Monday to hunt down every last thug responsible for so-called "flash mob" incidents over the weekend and throw the book at them to get a handle on a problem that's damaging the reputation of downtown Chicago as a safe place to live, work, play and shop.
Speaking as five teens made their first appearances in court in connection with a string of five robberies - four within a 10-minute span - in Streeterville Saturday, McCarthy said police had made "in excess of 20 arrests" connected to flash mobs over the weekend.
Chicago's top cop vows to hunt down 'flash mob'