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. REUTERS/NTV via Reuters TV (JAPAN – Tags: ENVIRONMENT DISASTER ENERGY BUSINESS IMAGES OF THE DAY) NO SALES. NO ARCHIVES. TEMPLATE OUT. JAPAN OUT. NO COMMERCIAL OR EDITORIAL SALES IN JAPAN. BBC WORLD, CNBC, NBC MUST ON-SCREEN COURTESY NTV IF PICTURES TO BE SHOWN ON CABLE OR COMMUNICATION SATELLITE SERVICES IN JAPAN. MUST ON SCREEN COURTESY “NTVU+30FBNNN Japan”