The national Delta Delta Delta sorority said it is “cooperating fully” with the University of Oklahoma’s investigation into a video in which fraternity members chanted a racial slur and made references to lynching.

The university shut down the fraternity, Sigma Alpha Epsilon, whose national office apologized and said it would expel all of the members involved. At least one young woman can also be seen from behind in the video, clapping her hands along with the chant.

The woman hasn’t been identified, but late Monday, the national office of Delta Delta Delta sorority said in a brief statement that it was “cooperating fully with our partners at the university as they investigate this matter.”

“Tri Delta expects its members to uphold the highest responsibilities of college women,” it said. “The behavior documented in the video is deplorable and is in no way consistent with Tri Delta’s ideals and core values.”

Late Monday, Delta Delta Delta’s OU chapter sought to tamp down suspicions about its members involvement in the video. “The Theta Gamma chapter is not under investigation by the university, nor have any chapter members been identified within the videos released,” the sorority’s local chapter said in a statement to The Oklahoma Daily, the university’s student run newspaper.

Former Sen. David Boren, the university’s president, called participants in the video “disgraceful” Monday, saying in a statement: “You have violated all that we stand for. Real Sooners are not racist. Real Sooners are not bigots.”

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