The Bank of Japan decided Thursday to leave its monetary policy unchanged amid uncertainty over Britain's possible exit from the European Union. 
The dollar fell sharply against the yen to around mid-104 yen levels, the lowest since September 2014, immediately after the BOJ announced the decision at the end of a two-day policy meeting, according to Japan's (Kyodo) News Agency. 
The BOJ said the economy "has continued its moderate recovery trend," leaving its basic assessment unchanged, although exports and production remained sluggish due to a slowdown in emerging economies.