Even as consensus built within the Federal Reserve in June about the likely need to begin pulling back on economic stimulus measures soon, many officials wanted more reassurance the employment recovery was on solid ground before a policy retreat.

Financial markets have largely converged on September as the probable start of a reduction in the pace of the U.S. central bank's $85 billion in monthly bond purchases, but minutes of the Fed's June meeting released on Wednesday suggested that might not be a sure bet.

"Several members judged that a reduction in asset purchases would likely soon be warranted," the minutes said. But they added that "many members indicated that further improvement in the outlook for the labor market would be required before it would be appropriate to slow the pace of asset purchases."

Editor's Note: Economist Unapologetically Calls Out Bernanke, Obama for Mishandling Economy. See What They Did

Global investors have recently recovered from a mild bout of panic that followed Fed Chairman Ben Bernanke's roadmap for an end to so-called quantitative easing, which he said would likely draw to a close by the middle of next year.

Financial market fears have been allayed in part by a chorus of Fed officials who have sought to reassure traders that the end of asset buys will not lead to imminent interest rate hikes.

"Many members indicated that decisions about the pace and composition of asset purchases were distinct from decisions about the appropriate level of the federal funds rate," the minutes said.

Whether the markets have gotten the message is not fully clear; the yield on the 10-year U.S. Treasury note has risen a full percentage point in just two months and stands close to its highest levels since 2011.

This has already slowed activity in the mortgage market, which had been key to the recent economic rebound.

At their June meeting, some Fed officials worried not only about the outlook for employment, but the pace of economic growth as well. Many economists believe the economy grew at less than a 1 percent annual rate in the second quarter, although most look for a pick-up in the second half of the year.

"Some (officials) added that they would ... need to see more evidence that the projected acceleration in economic activity would occur, before reducing the pace of asset purchases," the minutes said.

Of the Fed policymakers who argued it would be wise to curtail bond purchases soon, two thought it should be done "to prevent the potential negative consequences of the program from exceeding its anticipated benefits."

Editor's Note: Economist Unapologetically Calls Out Bernanke, Obama for Mishandling Economy. See What They Did