This still image taken from news program by NHK on March 14, 2011 shows the No. 3 nuclear reactor of the Fukushima No. 1 nuclear power station after a hydrogen explosion. Japan's Nuclear and Industrial Safety Agency said Monday that hydrogen blast occurred at the No. 3 nuclear reactor of Fukushima No. 1 nuclear power plant at 02:01 GMT (11:01 local time). [Xinhua/NHK]