(CNN) Students at an Oklahoma City high school say a college recruiter told them to line up by skin color and then by whether their hair was "nappy" or straight.

The recruiter was speaking to the entire 11th grade class at Harding Charter Preparatory High School on February 24, according to a statement on the high school's Facebook page

The recruiter from Oklahoma Christian University has not been identified, but the university said it did not approve the inappropriate activity before the event.

"He led a racist activity that was offensive, harmful and inappropriate. I'm embarrassed and I'm ashamed and I'm mad at what happened and I'm very, very sorry," Oklahoma Christian University President John deSteiguer said at a meeting Sunday. "Within an hour after the school visit, the admissions counselor was no longer employed at the university."

A spokeswoman for the university would not say whether the recruiter was fired or resigned.

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