Water contaminated with radioactive material that leaked from the Fukushima nuclear plant in Japan may have seeped into groundwater, officials said Saturday.

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Power for a nuclear reactor's cooling system at Tokyo Electric Power Co.'s Fukushima Daiichi plant was restored Friday after a temporary outage, officials said.

A rat or a similar animal may have shorted power supply to the systems to cool spent fuel pools at Japan's crippled nuclear power plant, its operator said.

Radiation is still at dangerous levels inside the contamination zone of Japan's Fukushima nuclear power plant, says an eyewitness report.

Residents living near Tokyo Electric Power's crippled nuclear reactor sued Tepco and the Japanese government for radiation exposure and forced evacuations.

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A fish caught near the Fukushima nuclear plant contained levels of radioactivity 5,100 times above the state-set safety limit, Tokyo Electric Power Co. said.

Japan's Nuclear Regulatory Authority will digitize about 900,000 pages of government documents on the 2011 Fukushima nuclear crisis, an authority official said.

Eight U.S. Navy personnel who took part in earthquake relief efforts in Japan are suing Tokyo Electric Power Co. in U.S. federal court over radiation exposure.

Operators of the damaged Fukushima nuclear power plant in Japan say they've restarted debris removal from the facility's Number 3 reactor building.

The Liberal Democratic Party's victory in Japan's elections is seen as a boost for nuclear energy, experts say.

A three-day conference on nuclear safety has begun in Japan's nuclear disaster-stricken Fukushima prefecture, officials said.

The Niigata provincial governor suggests he will allow the restart of a nuclear power plant reactor shut down since a 2007 Japanese earthquake.

Japan's Chugoku Power Co. announced it will help China's Huaneng Group to improve its energy efficiency.