<p> "We are looking into the cause and the situation and we'll make that public when we have further information," Edano said.</p>.<p> "At present, we think 10 km evacuation is appropriate."</p>.<p> Japan earlier in the day warned of a meltdown at a reactor at the plant, damaged when a massive earthquake and tsunami struck the northeast coast, but said the risk of radiation contamination was small.</p>.<p> Edano also said that Japan has expanded the evacuation area around the Fukushima Daini nuclear plant. (Reporting by Kiyoshi Takenaka; Editing by Joseph Radford) </p>
<p> "We are looking into the cause and the situation and we'll make that public when we have further information," Edano said.</p>.<p> "At present, we think 10 km evacuation is appropriate."</p>.<p> Japan earlier in the day warned of a meltdown at a reactor at the plant, damaged when a massive earthquake and tsunami struck the northeast coast, but said the risk of radiation contamination was small.</p>.<p> Edano also said that Japan has expanded the evacuation area around the Fukushima Daini nuclear plant. (Reporting by Kiyoshi Takenaka; Editing by Joseph Radford) </p>