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Japan Stocks Suffer Third-Worst Trading Day on Radiation Risks

Japan’s shares tumbled, with the Nikkei 225 Stock Average and Topix index suffering their third-worst daily declines in history, on record trading volume as concern grew about the safety of nuclear plants damaged by the country’s worst earthquake.

Tokyo Electric Power Co., Asia’s biggest power generator, plummeted by the daily limit of 25 percent after the company confirmed an explosion at a third reactor and a fire at a fourth today at its nuclear plant in Fukushima, north of Tokyo. Hitachi Ltd., which provides nuclear power generation systems, plunged 13 percent. Mitsubishi UFJ Financial Group Inc., Japan’s largest bank by market value, at one point declined to the lowest since its listing in Tokyo.