Federal Reserve released its March monetary policy meeting minutes on Wednesday. Fed officials were divided over when to start to hike interest rate. Some official said that it is better to raise interest rate in June, some officials would like to wait longer and some officials would prefer to wait until 2016.

The Fed dropped "patient" from its outlook for monetary policy at its March monetary policy meeting. Investors expected that the central bank may start to hike its interest rate in June. But the released economic data showed that the U.S. economy slowed in early 2015.