Four people are injured after a shooting at a suburban Chicago shopping mall.  Last-minute Christmas shoppers were locked down inside the Oakbrook Center Mall Thursday night as around a hundred police officers swarmed the area.  Police say two people started shooting at each other in a corridor next to a department store.  One of the injured is thought to be a suspect and is now in custody.  The other three were apparently bystanders and the search is on for a second shooting suspect.  See more, here from NBC5Chicago