The FBI has also dispatched a specially designed robot to the scene in the event they get close enough to deliver a telephone or message to the fugitive.
There is more evidence, however, that Rudolph may not listen to negotiators. Sources say forensic specialists have confirmed what bomb-sniffing dogs first suspected: that the truck Rudolph used has nitro-glycerineÂ—or dynamiteÂ—residue on it. Investigators have openly hinted that they fear he used the truck to retrieve bomb-making equipment.
"It's possible that the truck may have been driven some distance out of the forest area and later back in again to where it was found," said Senior FBI Agent Woody Enderson.
Federal agents aren't predicting when this search will end. It could be 20 minutes, it could be 20 days, said one. But more and more they appear confident that it will end with Rudolph's capture. They think that because it now appears clear that he is not on the run to faraway places. He has gone to ground near his old hometown. Agents say if he stays there, then they'll fin him.
CBS News Correspondent Jim Stewart