FROM CBS 2 CHICAGO (CBS) -- A mob of more than 20 teenagers descended on a trendy Wicker Park shop on Saturday and made off with more than $3000 worth of jeans. CBS 2′s Derrick Blakley reports the incident was caught on store surveillance cameras, and the owner posted the video on YouTube. Luke Cho said he hopes the images help police find the robbers, or maybe even shame the parents of the teens enough that they'll turn the kids in. From the moment the teens started flooding in the door at Mildblend Supply Co. on Milwaukee Avenue around 6:40 pm Saturday, Cho knew something wasn't right. "You see a group a group of teenagers walking in -- or marching in -- one-by-one. As you can see, it looks like it's some kind of procession," Cho said while reviewing the surveillance video on Sunday. To Cho, it looked like a flash mob was about to rob the store, so he immediately locked the door. "At least I think I kind of maybe stopped the flow a little bit, but I quickly realized something bad's about to happen, and I alerted my staff to call 911," Cho said. Most of the group flocked to an corner of the store right beneath a security camera, and appeared to know exactly what they were looking for: an exclusive, expensive brand of jeans called Nudie Jeans, which average about $200 a pair. "We happen to be one of the few that sell Nudie Jeans in the city," Cho said. The teens tried to get out of store, but not before doing more shopping, stuffing their backpacks with merchandise, while ...