As of 9:15 a.m., the 225-issue Nikkei Stock Average dropped 627.24 points, or 3.23 percent, from Friday at 18,762.19.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, fell 47.13 points, or 3.23 percent, at 1,412.36.
Air transportation, bank and insurance issues comprised those that declined the most in the opening minutes after the morning bell.
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