CurrenciesMarket participants unwind dollar positions as warnings of possible Japan action growComments by a South Korean currency official have added to speculation about coordinated action by Japanese authorities following the yen's surge against the U.S. dollar. (Photo by Akira Kodaka)Nikkei staff writersJuly 2, 2026 19:58 JSTUpdated on July 3, 2026 00:40 JSTTOKYO -- The yen surged against the U.S. dollar on Thursday, briefly strengthening into the 160-per-dollar range for the first time since June 19, as market concerns mounted over possible currency intervention by Japanese authorities.