significantly to investigators and in that panic-stricken crowd. then the paperwork goes on to say, he glances to the east and then calmly but rapidly moves, begins moving to the west, away from the direction of the finish line. he walks away without his knapsack having left it on the ground where he had been standing. approximately 10 seconds later an explosion occurs in the location where bomber two had placed his knapsack. bill. bill: this man is shot in the throat. we're told not to assume this was self-inflicted but he is offering a confession from his hospital bed in some manner and by some sort. how would that be, molly? >> reporter: actually this confession of some sorts, possibly really a warning, is something that happened during the carjacking according to this court he paperwork. this is revealed under the heading in these documents, as, bombers emerge. this happens after their photos are put out by the fbi. this is when fbi agents believe these suspects were