The Japanese yen saw a sharp increase against the US dollar, with the dollar falling by 2.6% to 159.225 yen, its weakest since May 14. This sudden move has led market analysts to widely suspect that Japanese authorities intervened to prevent the yen from depreciating further, although there has been no official confirmation. This intervention would be aimed at combating the rising cost of living due to expensive energy imports.

The suspected intervention occurred as the dollar was already weakening across the board due to softer-than-expected economic data from the U.S. This included slower inflation in June, a dip in the Personal Consumption Expenditures Price Index to 3.7% annually, and a disappointing 1.5% annualized GDP growth rate in the second quarter, below the forecasted 2.1%. The Federal Reserve also left interest rates unchanged, impacting dollar sentiment.

The timing of this suspected intervention is notable as it precedes the Bank of Japan's interest rate decision on Friday. While the BOJ is expected to keep rates at 1%, there are discussions among economists about a potentially faster pace of rate hikes to counter inflation. The market previously saw a similar intervention at the end of April when the yen appreciated by nearly $3 against the dollar, following a high of 160.72. Japanese officials have consistently warned of potential action to address currency weakness.