NBC Sports broadcaster Al Trautwig on Monday apologized for controversial Twitter comments about the adoptive parents of U.S. gymnastics star Simone Biles.

NBC, owned by Comcast Corp., issued a statement from Mr. Trautwig saying he regretted a tweet the previous night in which he said that Ms. Biles’s adopted parents “may be mom and dad but they are NOT her parents.” He said his tweet was a reply to criticism about some of his on-air comments about Ms. Biles. He later deleted the tweet.

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