July 2 (Reuters) - General Motors ( GM ) on Tuesday

posted a slower rise in second-quarter U.S. sales, hurt by lower

fleet sales to daily rental companies and a cyber incident at

CDK that impacted dealers across the country.

Overall sales rose about 0.6% to 696,086 units, compared

with an increase of about 19% in the same period last year.

"Our dealers who use the CDK platform are working to meet

strong customer demand under difficult circumstances. Some

deliveries may be delayed until Q3," GM said.