The U.S. Federal Reserve is likely to act soon to quell investor panic over the potential tapering of its bond-buying program, Fed watcher Jon Hilsenrath wrote in the Wall Street Journal late on Thursday.

Speculation over whether or not the Fed will pullback its $85 billion a month bond-buying program and the timing of that, has led to volatility in global markets, particularly within Asia. Japan's Nikkei, for example, has plunged near 20 percent from its five-and-a-half year high hit on May 23.