The 225-issue Nikkei Stock Average plummeted 1,478.49 points, or 7.97 percent, from Thursday at 17,081.14.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, tumbled 95.59 points, or 7.20 percent, to 1,232.29.
Mining, real estate and air transportation issues comprised those that declined the most by the morning break.
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