 We are learning more about the attempted assassination. ABC senior investigative correspondent Aaron Katursky is in shooter Thomas Crooks' hometown of Bethel Park, Pennsylvania. Before the rally, a new DHS and FBI bulletin said Thomas Crooks bought 50 rounds of ammunition from a gun shop near his home. In the last several months, the bulletin said Crooks received packages marked as containing hazardous materials, and two crude explosive devices were found in the shooter's car and one here at the house.