It was not immediately known whether there was a radioactive materials leak, the Ministry of Education, Culture, Sports, Science and Technology announced Saturday.

日本文部科学省于周六表示，目前还不清楚放射性材料是否发生泄漏。

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UNESCO, as lead agency for the UN Decade of Education for Sustainable Development, organized the event together with the Government of Sweden and the Ministry of Education, Culture, Sports, Science and Technology of Japan.

UNESCO: Educating for a sustainable future: UNESCO galvanizes support at RIO+20 | United Nations Educational, Scientific and Cultural Organization