About the attacker? >> yes, this is a widespread investigation. it of course includes the san francisco police department, the district attorney and also the capitol police, and the fbi. a lot of it is really focusing on the alleged attacker, david depape, 42 years old. we know he has led an unusual life for certain. it has culminated in recent months, apparently with a lot of blog posts and social media posts that are really going through a pottery of hate and conspiracy theories and the like. authorities are trying to piece that together. they might have an idea about the motive but they are...