but this is a con country that is tense. last october there was a bombing that cull ed over 100 people an in july there was a bombing on the turkish border that killed over 30 people. the turk irk government has blamed isis for attacks, although isis didn t claim responsibility. but you have that neighboring civil war down in syria. you also have the turkish security forces battling kurdish militan militants. so it is a tense time, but they are looking into this explosion trying to figure out what happened and, again, as of now no one has claimed responsibility. ian lee, thank you so much. more americans are heading to the war zone in both iraq and syria. we heard from secretary of defense ash carter today. he announced an expansion of special forces operations and a new role that could put commanders face to face with is isis. joining me is jim sciutto, our chief national security correspondent. precisely from the secretary of