four prefectures around the nuclear plant and south korea could be following that lead any time now. jenna: david piper in japan. thanks. jon: for more on the growing are crisis in japan let s bring in james acton, a physicist, an associate in the nuclear program at the carnegie endowment, and a stanton university fellow. where do you think the black smoke is coming from? there was some speculation the other day that one of the fires in one of the reactors in unit 4 may have been caused by a lubricant fire and all this heavy machinery that sits in the nuclear reactorment that its is just speculation. i haven t heard reliable information on what might be causing that smoke. the fact that there is smoke billowing out of the reactor is clearly cause for concern. jon: the reports that there is