(Reuters) -A technical glitch affecting dissemination of market data for the S&P and Dow Jones indexes on Thursday has been resolved, exchange operator CME Group ( CME ) said.

Trading continued normally, with the benchmark S&P 500 index and the Dow Jones Industrial Average down 0.3% and 0.9%, respectively.

The data freeze lasted for about an hour but trading appeared unaffected during the pause, according to reports by CNBC and Bloomberg News.

CME and S&P did not immediately respond to a request seeking additional details.

CME owns a stake in S&P Dow Jones Indices, which operates some of the most popular benchmarks for U.S. equities.