WASHINGTON — The Federal Reserve left its key interest rate unchanged Wednesday and projected no rate hikes this year, reflecting a dimmer view of the economy as growth weakens in the United States and abroad.

The Fed said it was keeping its benchmark rate — which can influence everything from mortgages to credit cards to home equity lines of credit — in a range of 2.25 percent to 2.5 percent. It also announced that by September, it will no longer reduce its bond portfolio, a change intended to help keep long-term loan rates down.

Combined, the moves signal no major increases in borrowing rates for consumers and businesses. And together with the Fed's dimmer forecast for growth this year — 2.1 percent, down from a previous projection of 2.3 percent — the statement it issued after its latest policy meeting suggests it's grown more concerned about the economy. What's more, with inflation remaining mild, the Fed feels no pressure to tighten credit.

In signaling no rate increases for 2019, the Fed's policymakers reduced their forecast from two that were previously predicted in December. They now project one rate hike in 2020 and none in 2021. The Fed had raised rates four times last year and a total of nine times since 2015.

The central bank's theme Wednesday, in its statement and in a news conference by Chairman Jerome Powell, is that it will remain continually "patient" about pursuing any further rate hikes.

Stock market indexes initially rallied on the news, but the gains soon faded and many stocks finished the day down. The Dow Jones Industrial Average lost 141 points, or 0.5 percent. Analysts said the Fed's downgraded outlook for the economy might have alarmed investors.

"We think the Fed's forecasts are still too upbeat," said Michael Pearce, senior U.S. economist at Capital Economics, saying he thinks sluggish growth will lead the Fed to start cutting rates early next year.

The Fed's decision Wednesday was approved on an 11-0 vote.

Still, stock prices have been generally surging since early January, when Powell abruptly reversed course and made clear that the Fed was in no hurry to raise rates and would likely slow the runoff from its balance sheet.

And while stocks struggled Wednesday, the Fed's plans for no credit tightening this year sent Treasury yields tumbling, with the 10-year yield touching its lowest level in more than a year. The yield reached 2.53 percent, down from 2.61 percent late Tuesday and 3.2 percent late last year.

The Fed's policymakers have clearly settled on the belief that more than a decade after they cut their benchmark rate to a record low near zero — and kept it there for seven years — that rate has now reached what's called "neutral" — neither stimulating nor restraining economic growth.

The central bank's pause in credit tightening is a response, in part, to slowdowns in the U.S. and global economies. It says that while the job market remains strong, "growth of economic activity has slowed from its solid rate in the fourth quarter."