But soon before the May 2015 violence, he came back onto the FBI's radar because of postings on social media. In a preliminary investigation, agents may track phone calls and obtain Internet communications and bank records. Again, agents found no significant radical ties and shifted their focus away. But after a 10-month investigation the FBI closed the case, finding no criminal charge to pursue. "So far, the honest answer is, I don't think so," FBI Director James Comey says.

Source: Fox News June 13, 2016 21:00 UTC