andrew wilder, to you first. on today's bombing. these are rare, as we said, have been years since something like this has happened in afghanistan. sectarian violence on shiites. what is the significance that it's happening now? >> as if afghanistan needed a new kind of violence. we haven't seen this kind of sectarian attack in afghanistan. it's quite frequent and common in pakistan to see this kind of attack. but not in afghanistan. that's why it's very unusual. again, a coordinated attack in three cities at the same time. really unfortunate to see this kind of sunni-she a type of violence in afghanistan. the attacks have been mostly directed at official tarring hes, military targets but not sectarian tarring hes like the shia community. >> woodruff: we reported that a pakistani sunni militant group claimed responsibility. how do you see this, the significance of this taking place right now? >> good evening, judy. thank you so much for having me. i agree. it's a tragic and troubling event that we're seeing this kind of sectarian at