Detailed text transcripts for TV channel - CNN - 20110316:12:00:00
Senior international correspondent stan grant is live in tokyo. do we know any more details on what they think may have caused that and what they think it is at this point, stan? >> reporter: no, they don't. and that is the problem, kiran. so many questions here that are not answered. you mentioned that white cloud of smoke. they are looking into exactly what has caused that and they are still working on whether this consumption vessel that surrounds the core of the nuclear reactor holding in the more nasty radioactive substances has been breached. this is an ongoing concern and they have assu...