WASHINGTON (Reuters (LSE: TRIL.L - news) ) - The U.S. Federal Reserve on Wednesday is expected to hold interest rates steady and indicate slightly greater unease on inflation, while stopping well short of signalling higher borrowing costs are imminent.

A statement from the Fed's policy-setting Federal Open Market Committee outlining its decision and thinking on the economy is due around 2:15 p.m. (7:15 p.m. BST).

U.S. policy-makers face a deepening housing decline that looks like it will be a drag on economic growth for months to come, even as surging oil and commodity prices threaten to ignite broader inflation.

The Fed lowered the interbank federal funds rate to 2 percent at its last meeting on April 29-30 and has suggested it hopes rate reductions totalling 3.25 percentage points since mid-September will be enough to help the economy rebound from the housing downturn and a credit crunch.

Fed officials have little room to manoeuvre. While they have shown no inclination to lower rates further, they are still concerned about the economy's weakness. At the same time, they are worried that steep increases in food and energy costs could begin to exert upward pressure on a wider range of prices.

"Given the uncertainty about both upside and downside risks, the Fed is likely to stay on hold indefinitely," Deutsche Bank (Frankfurt: DB9999 - news) economists Joseph LaVorgna and Carl Riccadonna said in a note to clients.

Reports on Tuesday showed a big drop in U.S. consumer sentiment in June and a continued downward slide in house prices, illustrating the continued risks to growth.

At the same time, news that the largest U.S. chemical maker, Dow Chemical Co., would raise prices by as much as 25 percent and that mining titan Rio Tinto (LSE: RIO.L - news) had secured a deal with China's largest steel maker to nearly double the price Rio gets for iron ore raised the spectre of inflation.

Analysts expect the U.S. central bank's statement to reflect the view expressed recently by Fed Chairman Ben Bernanke that the economy appears to have skirted a deep recession.

"Concern about 'tail risk' of a severe downturn appears to have lessened since the last meeting, although downside risks to growth remain," Lehman Brothers (NYSE: LEH - news) economists Michael Hanson, Michelle Meyer and Zach Pandl wrote in a note to clients.

With risks of a deep downturn fading, Bernanke and Vice Chairman Donald Kohn have ratcheted up their warnings about the risk of inflation in recent weeks, emphasizing their resolution that expectations for higher inflation do not build. Any unmooring of inflation expectations could trigger a harmful spiral of rising prices and wages, they cautioned.

Analysts expect a nod to those inflation worries, but said the Fed would be very careful how it characterizes its concerns to avoid feeding market expectations that a rate-raising cycle is about to start.

(Editing by Leslie Adler)