Federal Reserve officials are increasingly confident in a durable recovery for the U.S. economy, even though they do not see employment picking up soon, according to minutes from their November meeting released on Tuesday.

Policy-makers also expressed some concern about possible adverse repercussions from their vow to keep interest rates low for an extended period, including unwanted speculative activity in financial markets.

Members noted the possibility that some negative side-effects might result from the maintenance of very low short-term interest rates, the U.S. central bank reported in the minutes.

(Reporting by Mark Felsenthal and Pedro Nicolaci da Costa; Editing by James Dalgleish)