 From ABC News, I'm Sherry Preston. Law enforcement officials in western Pennsylvania are still trying to figure out why gunman Thomas Michael Crooks, armed with an assault-style rifle, fired shots at former President Donald Trump over the weekend. The FBI has conducted more than 100 interviews, many of them right here in the neighborhood where the shooter lived. They've gained access to his phone now. They even know how he was able to take possession of the rifle, but none of that has established a clear motive.