Simpson Referencing News Today

What exactly did this fbi bulletin say? what else are investigators learning today about these gunmen? >> reporter: i can tell you what were learning from the fbi director is that fbi agents saw the tweets from simpson referencing the event in texas and that is what prompted the fbi to send that warning to garland police a few hours before the event. were learning that the fbi had no idea that simpson and his roommate was driving from their house here in phoenix, arizona, to texas to launch that...