investigators took surveillance video from this convenience store owned by poljung hwang. he told us police stopped by two weeks ago to look at his surveillance cameras. >> reporter: today's revelation was another surprise to a city that is already on edge. we spoke with baltimore resident tay chase. >> i think this is ridiculous. how you make a-- keep constantly stopping when you have somebody in pain telling you he needs medical attention but they ignoring that. >> reporter: scott, on monday, the convenience store behind me was looted. the owner says he came back to the store. he realized that the surveillance equipment was gone, along with his copy of what is an important potentially piece of evidence. >> pelley: jeff pegues, thank you, jeff. six officers involved in gray's arrest remain suspended. today, baltimore's mayor made this promise: >> if with the nation watching three black women at three different levels can't get justice and healing for this community, you tell me where we're going to get it in our country. >> pelley: mayor stephanie rawlings-blake was talki