Black smoke streams from a nuclear power plant damaged by a major earthquake that hit northwest Japan on July 16, 2007.
The magnitude 6.6 quake caused a radioactive water leak and a fire at one of the world's most powerful nuclear plants, the Associated Press reported.
The plant leaked about 315 gallons (1,200 liters) of water tinged with a small amount of radioactive material, some of which escaped into the Sea of Japan.
Japanese officials said the leak did not harm the environment, the Associated Press reported.
The quake was followed by a second, magnitude 6.8 quake hours later, according to the U.S. Geological Survey.
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Photograph by Japan Coast Guard/Kyodo News/AP