UPDATE 1-What to Watch in the Day Ahead - Wednesday, Sept. 17

(Adds details on FOMC policy statement) Federal Reserve Chair Janet Yellen delivers a press conference after the FOMC policy statement. The Federal Reserve may lay a little groundwork for a future interest rate increase as it wraps up a two-day meeting. Economists are divided over whether the central bank may drop its pledge to wait a "considerable time" after ending a bond-buying program next month before raising interest rates. The Fed will leave rates unchanged and lop another $10 billion o