NEW : Japan and United States issue different radiation warning zones . Tokyo ( CNN ) -- Obama emphasizes that the U.S. is determined to do everything possible to support Japan . Kan briefs the president about efforts to contain the nuclear emergency at the Fukushima plant . Comment:
NEW : Japan and United States issue different radiation warning zones . Obama emphasizes that the U.S. is determined to do everything possible to support Japan . Kan briefs the president about efforts to contain the nuclear emergency at the Fukushima plant . Comment: