(KRON) — Oakland A’s announcer Glen Kuiper apologized after he appeared to utter a slur on-air while calling the team’s game against the Kansas City Royals Friday night.

Kuiper was referencing the Negro League Baseball Museum in Kansas City, and says his words “didn’t come out quite the way I wanted it to.” The word that came out of his mouth sounded like the “n-word.”

“We had a phenomenal day today,” Kuiper said before the game started. “N***** League Museum and Arthur Bryant’s Barbeque.”

Kuiper was mentioning Kansas City’s Negro Leagues Baseball Museum, which honors the league that Black people played in before Major League Baseball integrated. Before the 6th inning began, Kuiper apologized.

“A little bit earlier in the show, I said something that didn’t come out quite the way I wanted it to,” he said. “And I just wanted to apologize if it sounded different than I meant it to be said. I just wanted to apologize for that.”

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Kuiper has been the A’s play-by-play announcer on NBC Sports for 18 years, famous for his “that baby’s gone” home run call. His older brother Duane Kuiper is the San Francisco Giants’ announcer.

The A’s posted a statement on Twitter following the incident.

“The language used by Glen Kuiper during today’s pregame broadcast is unacceptable. The Oakland Athletics do not condone such language. We are working to address the situation,” the club said.

Negro Leagues Baseball Museum President Bob Kendrick responded to the incident as well.

“I’m aware of the unfortunate slur made by Glen Kuiper,” he said on Twitter. “I welcomed Glen to the NLBM yesterday and know he was genuinely excited to be here. The word is painful and has no place in our society. And while I don’t pretend to know Glen’s heart I do know that my heart is one of forgiveness. I hope all of you will find it in yourself to do the same!”