we drill down on the terror in turkey with bulent aliriza, who directs the turkey project at the centertrategic and international studies. welcome. i.s.i.s. has claimed responsibility for this latest attack on new year's eve. do you think the evidence will point that they're the perpetrators? >> we have a statement by i.s.i.s. that in fact it was responsible for this outrage in istanbul. it's actually the first time i.s.i.s. claimed responsibility for terrorist acts in turkey, although a number of act of terrorism have been attributed to i.s.i.s. the method of operation by the gunman, apparently a single gunman involved, very much suggests this is i.s.i.s. and, as i said, there is a statement by i.s.i.s. that it did it. also, it's important to note on november 2 soon after the assault on mosul began, baghdady, the leaders of i.s.i.s., made a statement part of which was devoted to turkey in which he asked his followers to move against turkey because turkey had become, as he called it, an appos at a time state and -- aappostate state. >> brangham: for those who haven't followed so closely