jon: and we begin on this wednesday with brand new developments in the boston bombing investigation. good morning, i'm jon scott. jenna: hi, everybody, i'm jenna lee. as the fbi appeals to the public to come forward with photos or video or any other evidence in the deadly terror attacks, some dramatic new photos are turning into key clues or some say. take a look at these. the one on the left show as bag sitting on the ground near a mailbox outside the crowd barriers at the location of the second blast. then in the picture on the right, taken just after the explosion the bag seems to disappear. that image is blurred due to some of the graphic nature of casualties we talked about. dozens of the injured are still in the hospital. we'll keep you posted what investigators learn from these photos. mike tobin is live in massachusetts at the general hospital in boston. mike? >> reporter: the news coming out of the hospitals is generally optimistic. we heard from tufts medical