In this March 20, 2011 aerial photo taken by a small unmanned drone and released by AIR PHOTO SERVICE, the crippled Fukushima Dai-ichi nuclear power plant is seen in Okumamachi, Fukushima prefecture, northern Japan. From right to left: Unit 1, Unit2, Unit 3 and Unit 4. (AP Photo/AIR PHOTO SERVICE) MANDATORY CREDIT

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