very brazen robbery. a huge mob flooded a convenience store, grabbing items right off the shelves and it s all caught on tape. harris is at the breaking news desk with more for us. reporter: this is the second time you and i have talked about teenagers today. this time again two to three dozen teenagers inside a convenience store, according to the owner here they walk into this las vegas city stop very calmly, and you can watch it. doesn t look like much is going on. the owner says his loan worker who was there did exactly what he was supposed to do when he realized that some of the young girls were stuffing cans of soda into their purses and things started to get rowdy. the clerk shut the register and stepped back. a few minutes later the mob comes back, they call this a swarm. it is a group thug mentality. the first time they were there for about three and a half minutes. the second time for less than that. they took the clerk s cellphone apparently in an effort apparently to keep