July 30, 2011 8:56 pm Flash Mob Strikes in Center City A flash mob hit Center City, Philadelphia Friday night. Two people were injured, and others were robbed. Four people are in custody in connection with the case. US & World Videos 1:25 Residents in Montgomery County warned of possible fraud after mail stolen from collection boxes 2:09 ‘It feels like a slap in the face': Father responds to reinstatement of officer accused of killing son 1:41 11-year-old cancer patient receives floods of motivating letters from strangers near and far 1:43 An Ocean City boardwalk hotspot continues to delay reopening after a series of hold-ups 0:53 One of Philly's most popular cheesesteak spots is set to reopen Wednesday