Yen weakens against dollar after BOJ decision

The Bank of Japan said on Friday it will leave its monetary policy unchanged. On the Tokyo foreign-exchange market, the BOJ decision prompted investors to sell the yen. The Japanese currency dropped to the 156 yen-level, a fresh 34-year low.

Market watchers believe the wide interest-rate gap between the United States and Japan will remain for the time being.

That's driving the move to the higher-yielding dollar.