Federal Reserve Chair Jerome Powell sought Thursday to tamp down any concerns that the Fed might soon withdraw some of its support for the U.S. economy and stressed that any such pullback would be signalled far in advance.

During an online discussion hosted by Princeton University, from which Powell earned his undergraduate degree, the Fed chair said the recovery of the economy from the pandemic recession “is far from our goals.” The Fed had said after its last policy meeting last month that it would continue to buy $120 billion in bonds each month until the economy made “substantial further progress” toward the Fed’s goals of maximum employment and stable 2% inflation.

“When that happens — and we can see that clearly — we’ll let the world know,” Powell said. “We will communicate very clearly to the public and we’ll do so well in advance before actively considering any tapering of asset purchases.”

The bond purchases are intended to hold down longer-term interest rates to encourage consumers and businesses to borrow and spend. Lower rates on 10-year Treasurys, for example, reduce borrowing costs for home and car buyers. At the same time, the central bank is keeping its benchmark short-term rate at a record low near zero to help support the economy.

Powell’s remarks Thursday follow recent speculation in financial markets that the Fed might start reducing its bond purchases as early as this year, sooner than was previously expected. Investors have been selling Treasuries, increasing the yield on the 10-year Treasury note in the past week to about 1.1%, up from 0.9%.

The speculation was fueled by comments from several regional Fed bank presidents, including Raphael Bostic of the Atlanta Fed and Robert Kaplan of Dallas. Bostic said last week that he was “hopeful that in fairly short order we can start to recalibrate” the bond purchases. Bostic is a voting member of the Fed’s policymaking committee this year.

Members of the Federal Reserve’s Board of Governors, who carry particular weight on rate decisions, have stressed that any tapering of bond purchases won’t occur for months at least. One of them, Richard Clarida, said last Friday that he thought the purchases would likely continue at least into next year.

And Lael Brainard, another governor, said Wednesday that the current level of bond buying “will remain appropriate for quite some time.”

Some regional Fed bank presidents have signalled that any reduction in bond purchases is probably a long way off. Eric Rosengren, president of the Boston Fed, said in an interview with The Associated Press that “we are still very far from full employment…. Right now, we’re still in a recessionary economy, and we need to get out of that.”

Fed officials want to avoid a repeat of what became known as the “taper tantrum,” one of the Fed’s worst communications blunders. It occurred in 2013 under Chairman Ben Bernanke, who suggested that the Fed might soon start reducing the bond purchases it was engaging in at that time in the wake of the Great Recession. Bernanke’s remarks caught investors by surprise and triggered a spike in interest rates.