Japan was rocked by a strong, magnitude 6.5 earthquake on Friday.
Local media and authorities reported some buildings had collapsed while people were injured in the quake.
The country’s Chief Cabinet Secretary Hirokazu Matsuno added that one person was in cardiac arrest after the quake.
No abnormalities were reported at the Shika nuclear power plant in the area, or at the Kashiwazaki-Kariwa plant in the neighboring prefecture of Niigata, Matsuno added.
Japan's weather authorities revised the quake's magnitude to 6.5 from a preliminary 6.3, and warned against aftershocks.
"Earthquakes of large magnitude may occur, especially in the next three days," a meteorological agency official said, adding that tremors followed the large quake.
He urged residents of quake-hit areas to keep watch for about a week in case of further events of seismic intensity 6 or higher on the Japanese scale, which runs to 7.
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