in july, the president's brother ahmed wali karzai, was shot down in his kandahar home. just weeks later, the mayor of kandahar died in another suicide attack with explosives hidden in a turban. the taliban claimed responsibility for both murders. their goals, to take out people in positions of power and authority. and many of those people are key to the american forces' exit strategy from afghanistan. >> pelley: so, mandy, i wonder, where do the afghans go at this point? >> reporter: well, as of tonight there may be nowhere to go. rabbani has built relationships with numerous insurgent groups and there appeared to be some progress so as of now these negotiations are probably dead. >> pelley: mandy clark. thank you very much. the bombing happened just before afghan president hamid karzai met with president obama at the u.n. in new york. karzai cut short the visit and headed home. chief white house correspondent norah o'donnell is at the u.n. norah? >> reporter: good evening, scott. this is a horrific assassination of an afghan leader that the u.s. viewed as a unifying fi