To date, we have run down well more than a thousand leads in this investigation, while some of it has helped create a better profile into the madness of the suspect, we do not, still, have a clear motive or reason why. We all want answers. We have looked at everything, literally, to include the suspect's personal life, any political affiliation, his social behaviors, economic situation.
We're also aware, of course, that ISIS has repeatedly claimed responsibility, which, today, I can tell you that we have no known nexus to. In the past, terror attacks or mass murder incidents, motive was made very clear. Very clear in most of those cases by a note that was left, by a social media post, by a telephone call that was made, by investigators mining computer data.
Today, in our investigation, we don't have any of that uncovered. I wish we did. We will, and are, continuing to investigate with great tenacity and hope to arrive at an answer.