The BOI investigation stalled when none of the victims turned out to be the driver of the wagon. Though the horse was newly shod, investigators could not locate the stable responsible for the work. When the blacksmith was located in October, he could offer the police little information. Investigators questioned tennis champion Edwin Fischer, who had sent warning postcards to friends, telling them to leave the area before September 16. He told police he had received the information "through the air". They found Fischer made a regular habit of issuing such warnings, and had him committed to Amityville Asylum, where he was diagnosed as insane but harmless. Meanwhile, Robert W. Wood helped to reconstruct the bomb mechanism.