The yen slid sharply against the dollar and the euro on Monday after a U.S. Treasury official voiced support for Japan's efforts to boost growth and end deflation.
Wall Street and world equity markets were little changed in light volume as a lack of major economic news gave investors little reason to push stocks higher, for now.
The euro had already climbed as a European policymaker dismissed talk of intervening to weaken the currency, while U.S. stocks were unable to get further traction after hitting multi-year highs.
The dollar rose as high as 94.42 yen on Reuters data, the highest since early May, 2010, and was last up 1.8 percent at 94.33 yen.
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