Stock indices closed lower as investors are awaiting the results of the Fed's monetary policy meeting and the results of the European Central Bank's (ECB) Governing Council meeting.

The results of the Fed's monetary policy meeting are scheduled to be released at 18:00 GMT. The Fed will also release its economic forecasts. The Fed Chair Janet Yellen is scheduled to speak after the release of the results.

Investors are awaiting signals when the Fed starts raising its interest rate.

The ECB is expected to review its Emergency Liquidity Assistance (ELA) to Greek banks.

Concerns over the Greek debt problem still weighed on markets. Greek Prime Minister Alexis Tsipras said on Wednesday that he was ready to assume responsibility for the consequences of rejecting a deal with creditors.

The next round of talks is scheduled to at the finance ministers' meeting this Thursday in Luxembourg.

Greek Finance Minister Yanis Varoufakis said that Athens will not provide a new reform proposal.

Meanwhile, the economic data from the Eurozone was in line with expectations. Eurozone's final consumer price index rose 0.2% in May, in line with the previous estimate.

On a yearly basis, Eurozone's final consumer price inflation climbed to 0.3% in May from 0.0% in April, in line with the previous estimate.

Eurozone's consumer price inflation excluding food, energy, alcohol and tobacco climbed to an annual rate of 0.9% in May from 0.6% in April, in line with the previous estimate.

The Office for National Statistics (ONS) released its labour market data on Wednesday. The U.K. unemployment rate remained unchanged at 5.5% in the February to April quarter, in line with expectations. It was the lowest level since 2008.

The claimant count decreased by 6,500 people in May, missing expectations for a drop by 12,300, after a decrease of 7,800 people in April.

Average weekly earnings, excluding bonuses, climbed by 2.7% in the February to April quarter, exceeding expectations for a rise by 2.5%, after a 2.3% gain in the November to January quarter. It was the highest gain since December to February 2009.

Average weekly earnings, including bonuses, rose by 2.7% in the February to April quarter, exceeding expectations for a gain of 2.1%, after a 2.3% increase in the November to January quarter. It was the highest rise since June to August 2011.

The Bank of England monitors closely the wages growth it considers when to start hiking its interest rate.

The Bank of England's Monetary Policy Committee (MPC) released its May meeting minutes on Wednesday. All members voted to keep the central bank's monetary policy unchanged.

All MPC members noted that it was appropriate to keep the monetary policy unchanged.

Two members of the nine MPC said that the decision not to hike interest rate in April was "finely balanced" between voting to hold or hike interest rate repeating comments from the last minutes.

MPC members said that the monetary policy will depend on "the prospects for inflation in the United Kingdom and would not be determined by the actions of other central banks".

Indexes on the close:

Name Price Change Change %

FTSE 100 6,680.55 -29.55 -0.44 %

DAX 10,978.01 -66.00 -0.60 %

CAC 40 4,790.62 -49.24 -1.02 %