On September 12, 2009, Usui's family reported him missing from his hometown of Kasukabe when Usui did not return from hiking in nearby Gunma Prefecture.

2009年9月11日，臼井仪人前往群马县附近爬山，从此失去联系。9月12日，其家人向警方报案。

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On September 19, 2009, a body with clothes matching those described in the report filed by Usui's family was found at the bottom of a cliff at Mount Arafune in Gunma.

9月19日，警方在群马县“舻岩”崖底发现一具尸体，尸体的着装和臼井家人所描述的一致。

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The prefecture of Gunma, north of Tokyo, had no history of frequent or severe earthquakes.

FORBES: Connect

That image was very much in evidence on a recent visit by Obuchi to Gunma.

CNN: ASIANOW - TIME Asia

Elevated levels of radioactive iodine have also been found in neighboring prefectures of Tochigi, Gunma, Niigata, Chiba and Saitama.

FORBES: Radiation Found in Food and Water in Japan [Updated]