 People are saying, well, the proof that he probably didn't act alone and probably was a professional was he had improvised explosive devices. You can go online and figure out how to make them, and we don't know if they worked or not. The fact that he had them on his body when he was shot and they didn't go off suggests maybe he didn't know what he was doing. But he appears to have been a lone wolf not coordinating with anyone. This guy got caught because he couldn't keep his mouth shut.