(Updates with close of U.S. markets, Federal Reserve action)
By Herbert Lash
NEW YORK, April 30 (Reuters) - U.S. stocks fell on Wednesday after the Federal Reserve cut interest rates but left its next move unclear, causing the dollar to slip and raising the chances of still higher commodity prices ahead.
With an uncertain outlook on interest rates and after U.S. economic data showed the weakest consumer spending since 2001 and reduced business investment, investors locked in profits in stocks, which in April posted the first positive month since October.
The U.S. 30-year Treasury bond <US30YT=RR> traded a full point higher in price as a debt rally gained momentum after the Fed cut its benchmark lending rate to banks one-quarter of a percentage point to 2 percent.
Oil fell $2 a barrel, extending a retreat from a record high this week to more than 5 percent following a U.S. government report that showed crude oil stockpiles rose much more than expected in the world's top energy consumer.
The rate cut by the Fed -- which has now trimmed rates by 3.25 percentage points since September -- had been expected. But Fed policy-makers did not signal a pause in their rate-cutting campaign.
Many economists and analysts worry that the rate cuts will only spur higher inflation down the road and keep commodity prices on the boil, especially if rates are cut more in the future.
"They had such an opportunity to send (commodity) prices tumbling," said Peter Beutel, president of energy consultancy Cameron Hanover in New Canaan, Connecticut.
"Every time they cut rates and leave the door open for another cut, they basically are just giving away the store when it comes to commodity prices," Beutel said.
The dollar rose against the euro and extended gains against the yen immediately after the Fed announced its latest move. But then the U.S. currency pared gains against the euro and slipped against the yen on the view that the U.S. central bank had left the door open for further rate cuts.
Stocks rallied before the rate decision and extended gains after the announcement, only to fall later in the session.
The Dow Jones industrial average <
> fell 11.81 points, or 0.09 percent, to 12,820.13. The Standard & Poor's 500 Index <.SPX> fell 5.35 points, or 0.38 percent, to 1,385.59. The Nasdaq Composite Index < > fell 13.30 points, or 0.55 percent, to 2,412.80.Earlier, U.S. and European stocks had rallied.
Data on U.S. gross domestic product, business activity and employment had kept dollar sentiment positive by suggesting that the Fed might not have to cut interest rates after Wednesday.
Investors also drew comfort from a lower-than-expected loss at General Motors Corp <GM.N> and stronger-than-anticipated profit at consumer products maker Procter & Gamble Co <PG.N>.
GM posted a first-quarter loss due to a costly supplier strike, waning demand for its most profitable vehicles and $2.2 billion in charges related to struggling former subsidiaries. But its results beat Wall Street forecasts and its shares jumped 9.4 percent.
Procter & Gamble Co posted a higher quarterly profit as cost controls helped offset soaring prices for oil and other commodities. Its shares rose 1.8 percent.
In Europe, shares rose, boosted by the U.S. economic data and a raft of bullish company results, to post their best monthly performance in 4-1/2 years.
The FTSEurofirst 300 index <
> of top European shares closed up 0.7 percent at 1,337.68 points, the fifth gain out of the past six sessions. The index rose 6 percent in April, its best monthly performance since October 2003.Asian bourses closed mixed to lower. Tokyo's Nikkei 225 <
> shed 0.3 percent and Hong Kong's Hang Seng < > fell 0.6 percent. China's main Shanghai index < > bucked the trend and jumped 4.8 percent.Oil losses were limited late in the day after the Fed's rate cut indicated that it expects inflation to moderate -- a sign that more rate cuts are possible.
U.S. crude <CLc1> settled down $2.17 at $113.46 a barrel, before recovering in electronic activity to $114.62 after the Fed's decision. London Brent <LCOc1> fell $1.03 to $112.40 a barrel.
U.S. gold futures ended sharply lower for a second straight session, hurt by a slippage in crude oil prices, the stronger dollar and a drop in gold exchange-traded fund holdings.
The June contract <GCM8> in New York settled down 1.3 percent at $865.10 an ounce, about half an hour before the Fed announced its decision.
The dollar fell against major trading-partner currencies, with the U.S. Dollar Index <.DXY> down 0.34 percent at 72.617.
The euro <EUR=> rose 0.29 percent at $1.5612. Against the yen, the dollar <JPY=> fell 0.04 percent to 103.98.
U.S. Treasury debt prices rose. The benchmark 10-year U.S. Treasury note <US10YT=RR> added 20/32 to yield 3.75 percent. The 2-year U.S. Treasury note <US2YT=RR> rose 4/32 to yield 2.28 percent. The 30-year U.S. Treasury bond <US30YT=RR> climbed 37/32 to yield 4.48 percent. (Additional reporting by Ellis Mnyandu, Chris Reese and Gertrude Chavez-Dreyfuss in New York, and Alex Lawler in London; Editing by Jonathan Oatis)