Market participants remain skeptical of the impact of the government's $100 billion package aimed at curbing the rising yen, and are on the lookout for additional intervention in the near future.
Speculation over fresh intervention, possibly this week, is rising amid indications the U.S. Federal Reserve may further ease monetary conditions to boost the U.S. economy, triggering another surge of the yen.
Wednesday's policy announcement came as the government appears unlikely to persuade the Group of Seven industrialized nations to take concerted action and seems to be playing for time ahead of a September meeting of the G-7 finance ministers and central bank governors in France.