April 10, 2012, 6:17 amPolice asking for help tracking down a teenage flash mob of shoplifters. They were caught on camera as they stormed a Chevron store at SE 92nd and Foster Saturday night and made off with several hundred dollars worth of snacks. The owners say the teens confronted the clerk as they left. An outside camera caught one shoplifter tossing a milk crate at the clerk. Another teen tossed an outdoor floor display toward the clerk. Portland police say the teens could face robbery charges.