AlQa'dah 16, 1432, Oct 14, 2011, SPA -- U.S. President Barack Obama on Thursday commented on Iranian plot to assassinate the Saudi ambassador to the United States on American soil saying, "We believe that even if at the highest levels there was not detailed operational knowledge, there has to be accountability with respect to anybody in the Iranian government engaging in this kind of activity." At a news conference tied to the state visit of South Korean President Lee Myung-bak, Obama said facts were shared with world leaders with the aim of isolating Iran.