July 30, 2011 11:28 pm Flash Mob Strikes in Philadelphia Flash mob strikes in Center City Philadelphia Friday night left two people injured and several others robbed. Police have arrested four people in connection with the crime. US & World Videos 2:54 UPenn leaders reiterate to pro-Palestinian protesters that they need to disband 1:44 Pro-Palestinian protesters remain on UPenn's campus despite warnings to disband 1:30 Protests calling for ceasefire continue at Penn 6:33 Family affair: Former Eagle and new Eagle Jeremiah Trotter and Jeremiah Trotter Jr. speak out 0:20 Teen girl shot in Southwest Philly, suspect in custody