By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks were marginally lower on Wednesday with all attention turned to the Federal Reserve's two-day policy meeting and a press briefing by Fed Chairwoman Janet Yellen.

The main benchmarks paused after three days of modest gains.

The S&P 500 (SPX) was off 1 point at 1,940.81. The Dow Jones Industrial Average (DJI) shed 35 points, or 0.2% to 16,773.53. The Nasdaq Composite (RIXF) was off 6 points, or 0.1%, at 4,330.91.

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Kate Warne, investment strategist at Edward Jones, said she doesn't expect a change in the Fed's policy, which includes a steady reduction in its bond-buying program.

"Even the 2.1% inflation rate is still within the Fed's target and they are not likely to act on it. The Fed would be more concerned not to tighten too soon, they would need more evidence of accelerating recovery in the labor market," she added.

The Federal Open Markets Committee is to wrap up the second day of its meeting and release a statement at 2 p.m. Eastern, followed by a 2:30 p.m. Eastern press conference with Yellen.

The FOMC is expected to further reduce its bond-buying program by $10 billion to $35 billion a month, and leave the Fed funds policy target of 0% to 0.25% unchanged. Read: Fed could jolt markets with rate-hike views

Investors will watch for any comments from Yellen that point to when the Fed will begin to raise interest rates as the central bank moves closer to reaching economic-data milestones, including stabilization of inflation at 2%. Figures on Tuesday showed inflation hitting an unadjusted 2.1% rate in May. The market will also look for a possible reduction in the Fed's growth projection for this year.

* In corporate news, Amazon.com Inc. Chief Executive Jeff Bezos is expected to unveil its first smartphone at an event in Seattle, and speculation is that the device will feature 3-D capabilities. Amazon shares rose 1.8%.BlackBerry Ltd. shares rose 3.4% after the company announced a partnership with Amazon on Wednesday. that would give the smartphone maker access to Amazon's Appstore. Shares of FedEx Corp. rose 3.8% after the parcel delivery company's quarterly earnings and sales topped analysts' expectations.Adobe Systems Inc. leapt 9.6% after the company late Tuesday reported better-than-expected adjusted earnings.But La-Z-Boy Inc. shares slid 9% as the furniture maker's fourth quarter same-store sales fell 0.9%, compared with a 11.2% rise in the fourth quarter of last year.ConAgra Foods Inc. shares declined 5.8% after the packaged-food company said fiscal fourth-quarter earnings will miss expectations, as volume in its consumer foods segment declined 7% and its private brands unit posted weak profits.

* In overseas markets, Japanese stocks rose, outperforming other benchmarks throughout the region. European stocks clung to thin gains ahead of the Fed decision. Minutes from the Bank of England's meeting earlier this month, released Wednesday, signaled policy makers are moving closer to raising U.K. rates before year's end.

* Among commodities, gold for August delivery ticked down $1 to $1,270.6 an ounce. Crude oil futures added 39 cents to $106.75.

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