• The yen jumped against the dollar late on Wednesday, with traders on high alert for signs of intervention by Japanese monetary authorities to boost a currency languishing near 34-year lows.
  • The dollar fell sharply to 153 yen from about 157.55 yen for reasons that were not immediately clear, after the U.S. stock market closed and the Federal Reserve’s monetary policy meeting ended hours earlier.
  • The dollar was last at 154.85 yen.
  • The yen had rallied on Monday, with money market data suggesting Japan’s finance ministry had spent around $35 billion to prop up the currency that day. Official intervention data for the period will be announced at the end of May.