
The dollar swung sharply lower during New York trading on Thursday, at one point losing about 5 yen and falling below 158 yen.
The decline took the US currency to its weakest level since mid-May.
Informed sources reported on Friday (July 31) that the Japanese government and the Bank of Japan had entered the market during the session to purchase yen and sell dollars.
It was their first intervention of this kind in roughly three months.
The action appeared to have been carried out without advance notice.
Finance Minister Satsuki Katayama had issued no warning beforehand, unlike ahead of the previous intervention on April 30.
Katayama offered no confirmation when questioned by reporters in Tokyo on Friday morning, declining to comment on whether the authorities had intervened to support the yen.
[Copyright The Jiji Press, Ltd.]