 So here's what we've been able to find out. 20 years old, Thomas Matthew Crooks fired an AR-style rifle seen right there on that roof. That rifle purchased legally by the shooter's father. We're also learning investigators found bomb materials in Crooks' home and vehicle. Joining us live now from Bethel Park is CBS News Pittsburgh, Megan Schiller. Megan, you are in that neighborhood, in the community. That's such a big heartbeat of this broadcast. What are people saying, the neighbors, to this?