The Federal Reserve on Wednesday left in place its monthly $85-billion (U.S.) bond-buying stimulus plan, saying economic growth had stalled but indicating the pullback was likely temporary.
Describing the nation's job market as continuing its modest pace of improvement, the Fed repeated a pledge to keep purchasing securities until the outlook for employment improves substantially.
"Growth in economic activity paused in recent months, in large part because of weather-related disruptions and other transitory factors," the Fed said in its January policy statement.
It added business investment had picked up as financial conditions eased in recent months.
Kansas City Fed president Esther George, in her first-ever policy vote, dissented from continued Fed stimulus.
The Fed's bond-buying program is part of the central bank's unprecedented efforts to spark a stronger economic recovery and drive down unemployment.
The Fed has kept overnight interest rates near zero since late 2008 and it has tripled its balance sheet to about $3-trillion through its purchases of securities, which are aimed at pushing longer-term borrowing costs lower.
However, the recovery from the 2007-2009 recession has been stubbornly tepid.
A report on Wednesday showed the economy unexpectedly contracted in the fourth quarter, although economists said the data overstated the weakness and said they expected the recovery to strengthen as the year progresses.
Nevertheless, the economy has been too weak to do much to lower unemployment. Data on Friday is expected to show the jobless rate remained stuck at 7.8 per cent for a third straight month in January.
Since September, when the Fed launched its latest round of so-called quantitative easing, it has said it would buy bonds until it saw a substantial improvement in the outlook for the labour market, a mark many analysts think won't be reached this year.
More than half of 41 economists polled by Reuters earlier this month expect purchases to continue into 2014.
But minutes of the Fed's last meeting in December, released early this month, showed that a few policy makers thought the program should be halted by mid-2013, surprising financial markets.
Some Fed officials have voiced concern that any economic benefit from the bond purchases could be offset by mounting costs.
Some policymakers have warned the monetary expansion could fuel a bubble in asset prices, harm the functioning of Treasury and mortgage-backed bond markets, and perhaps lead the Fed to suffer a loss when it eventually sells assets to shrink its balance sheet, which could have serious political consequences.