May 30 (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.