The Dow Jones industrial average rose 13 points in morning trading, again putting it in range to close at its highest level in more than two years. Broader indexes were mixed.

By the end of the trading day, investors will likely know exactly how much the Fed plans to spend to stimulate the economy. The central bank has hinted for two months it plans to buy Treasurys to drive interest rates lower in an attempt to spark lending and spending. However, there was still plenty of debate about the size and length of the program, particularly in the past few days.

The Fed is expected to announce details of its plan when it wraps up its meeting Wednesday afternoon. Treasury prices rose slightly, sending interest rates lower ahead of the announcement.

The Dow rose 12.75, or 0.1 percent, to 11,201.32 in morning trading.

The has been flirting with its highest closing level of the year, which was 11,205.03 on April 26. If it can close above that level, it would be the Dow's best finish since September 2008, just before the financial crisis peaked.

The Standard & Poor's 500 index rose 0.75, or 0.1 percent, to 1,194.32, while the Nasdaq composite index fell 0.36, or less than 0.1 percent, at 2,533.16.

The yield on the benchmark 10-year Treasury note, which moves opposite its price, fell to 2.56 percent from 2.59 percent late Tuesday.

Key economic reports that would have normally affected trading are being overshadowed by the Fed's meeting.