A screen grab taken from news footage by Japanese public broadcaster NHK on March 14, 2011 shows the moment of a hydrogen explosion at the Fukushima No 1 nuclear power station number three reactor on March 14, 2011. An explosion shook a quake-damaged Japanese nuclear power plant on March 14 and plumes of smoke rose from the building, live television showed. Japan's nuclear safety agency said the blast, at the number 3 reactor at the Fukushima No 1 plant, was believed to be caused by hydrogen.
