Japan's Ministry of Finance said on Friday it did not intervene in the foreign exchange market from June 29 to July 28, when the yen touched its highest level against the dollar since December.
Japanese authorities have stayed out of the market for more than six years. The last time they intervened to sell the yen was in March 2004, when they conducted yen-selling, dollar-buying intervention.
On July 16, the dollar fell to 86.27 yen on trading platform EBS, the lowest since early December. The dollar has since extended its losses, touching an eight-month low of 86.15 yen on Friday.
A fall below 84.82 yen on EBS would take the dollar to its lowest level against the yen in 15 years. (Reporting by Masayuki Kitano; Editing by Hugh Lawson)