 The FBI has identified the shooter as 20-year-old Thomas Matthew Crooks of Bethel Park, Pennsylvania. Investigators say they found rudimentary bomb materials at his home and in his vehicle and a suspected triggering mechanism in his possession. Law enforcement sources say the rifle found on the shooter's body was legally purchased by and registered to his father. Crooks was shot to death by Secret Service agents after he killed one man at the rally. CBS's Jared Hill.