As of 9:15 a.m., the 225-issue Nikkei Stock Average lost 270.17 points, or 1.37 percent, from Monday to 19,398.95.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, fell 14.74 points, or 1.03 percent, at 1,417.67.
Mining, oil and coal product, along with pulp and paper, and iron and steel issues comprised those that declined the most in the opening minutes after the morning bell.
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