As of 9:15 a.m., the 225-issue Nikkei Stock Average lost 227.88 points, or 0.75 percent, from Thursday to 29,988.87.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, fell 9.37 points, or 0.47 percent, at 1,999.14.
Mining, rubber product, and oil and coal product-oriented issues comprised those that declined the most in the opening minutes after the morning.
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