As of 9:15 a.m., the 225-issue Nikkei Stock Average tumbled 472.63 points, or 2.28 percent, from Friday to 20,238.28.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, fell 30.17 points, or 2.01 percent, at 1,472.08.
All industry categories retreated into negative territory, with marine transportation, oil and coal product, and insurance-linked issues comprising those that declined the most in the opening minutes after the morning bell.
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