 So, Bill, the investigation has got at least two aspects. One is how the shooter was the security failure and how the shooter was allowed to get so close. The other is the shooter and his motivations. Thomas Crooks, apparently they have his cell phone, though apparently they have not been able to get into it yet. I assume that's just a matter of time. Then there's this idea that he had explosive devices or at least materials for it in not only his van, but at home.