 It hasn't found any social media posts or writings that contain violent or threatening language. There's no indication that Crooks had mental health issues, no criminal record. It appears that he acted alone. The FBI says that it has interviewed nearly 100 people so far in this investigation. It's finished searching Crooks' home and vehicle. It now has access to his phone. The hope is that all of that investigative activity may help fill in some of the gaps that we have right now and provide an answer, of course, to the question of motive.