 And that could be answered at any time. In the wake of the attempted assassination on Saturday that killed one spectator, investigators are hunting down for any clues that may have drove Thomas Matthew Crooks of Bethel Park, Pennsylvania, to carry out that shocking attack. The FBI says it believes Crooks, who had bomb-making materials in the car he drove to the rally, did act alone. The Dow had 226 points. The Nasdaq is up 86 points.