If they don't get any clues really soon I don't think there's any hope they will catch the one responsible for this tragedy.It could of been placed in there at any time or someone could of eaten and left it there somewhere. Could of had a timer on it or they set it off by cell phone and that's the reason they shut down the cell phone service.
I would like to know who did it? I hope they get some clues fast.
It's possible that the devices were stored in the adjacent buildings and were then moved carefully to the place where they would ultimately blow up. Probably would have been easy to do since everyone that attends the race is focused on watching it. Everyone except for the over 2,000 national guard that was present...