Even another fall in the yen to three-year lows failed to motivate buyers of exporters, and the Nikkei 225 Average tumbled 2.2%, or 229.27 to 10,050.98, led by major electronics component makers and suppliers. US Treasury Secretary Paul O'Neill said in Tokyo that Washington had no concerns about the currency's decline against the US dollar. Today it fell to 133.56 compared with an overnight level of 132.64.