In this Monday, March 4, 2013 photo, a sign warns people to say out of an area where piles of radiation-contaminated soil sit on the sports field of a school in the abandoned town of Yamakiya, outside the exclusion zone surrounding the Fukushima Dai-ichi nuclear plant in Japan. Two years after the triple calamities of earthquake, tsunami and nuclear disaster ravaged Japan's northeastern Pacific coast, radioactive and chemical contamination remains a threat as clean-up projects face troubles with organized crime and mishandling. (AP Photo/Greg Baker)

Associated Press
In this Monday, March 4, 2013 photo, a sign warns people to say out of an area where piles of radiation-contaminated soil sit on the sports field of a school in the abandoned town of Yamakiya,  outside the exclusion zone surrounding the Fukushima Dai-ichi nuclear plant in Japan. Two years after the triple calamities of earthquake, tsunami and nuclear disaster ravaged Japan's northeastern Pacific coast, radioactive and chemical contamination remains a threat as clean-up projects face troubles with organized crime and mishandling. (AP Photo/Greg Baker)
In this Monday, March 4, 2013 photo, a sign warns people to say out of an area where piles of radiation-contaminated soil sit on the sports field of a school in the abandoned town of Yamakiya, outside the exclusion zone surrounding the Fukushima Dai-ichi nuclear plant in Japan. Two years after the triple calamities of earthquake, tsunami and nuclear disaster ravaged Japan's northeastern Pacific coast, radioactive and chemical contamination remains a threat as clean-up projects face troubles with organized crime and mishandling. (AP Photo/Greg Baker)
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