Elton Simpson (on left) , reportedly tweeted minutes before the attack that he and his fellow assailant had pledged allegiance to Islamic State leader Abu Bakr al-Baghdadi. The FBI knew Elton Simpson was heading to Garland, Texas. It’s not clear if local authorities were notified. FBI Director James Coomey said they may have missed others. Comey added: “There are “hundreds, maybe thousands” of people across the country who are receiving recruitment overtures or directives to attack the U.S.”