Smoke rises from Fukushima Daiichi nuclear power complex in this still image from video footage March 14, 2011. A fresh explosion at the quake-stricken nuclear power complex on Monday is unlikely to have led to a large escape of radioactivity, the government said. Japanese Chief Cabinet Secretary Yukio Edano was speaking after a hydrogen explosion at the No 3 reactor in the plant, which sent a plume of smoke into the air. [Photo/Agencies]