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Japan's crippled Fukushima nuclear plant is not fully prepared for heavy rain and winds of a typhoon heading towards the country, officials admit. Tokyo Electric Power (Tepco), which runs the plant, said some reactor buildings were uncovered, prompting fears the storm may carry radioactive material into the air and sea.

Typhoon Songda is expected to hit mainland Japan as early as Monday.

"We have made utmost efforts, but we have not completed covering the damaged reactor buildings," a Tepco official said on Saturday. "We apologise for the lack of significant measures against wind and rain," the official added.

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