Transcript for Flash Mobs Rob 3 Chicago Sports Authority Stores
Please -- Chicago are searching for this pack. A flash -- thieves burst in distort grabbing arm falls. Even entire racks of clothes. -- -- -- pushing -- out the door just in seconds before taking off and get -- car. There's several of them coming in at once. And before you really realize it's happening said that no crime is less than thirty seconds. You can't really react that quickly -- what's going.
This transcript has been automatically generated and may not be 100% accurate.