Tokyo, April 28 -- Japan business leaders expressed their concerns over a weaker yen after the central bank decided to keep the monetary policy unchanged, while the Japanese currency plunged to a fresh low over the weekend.

The Japanese yen on Friday weakened to a new low since May 1990 around the 158-yen range against the U.S. dollar in New York, after the Bank of Japan (BOJ) on Friday decided to keep guiding short-term interest rates in a range of zero and 0.1 percent.

The announcement weakened the country's currency against the dollar to multiple new lows, and it is widely believed among market watchers that the interest-rate gap between the United States and Japan is likely to remain for the time being.

Business leaders in Japan have...