COLUMBIA, Mo. (AP) – The University of Missouri is investigating after two black female students said other students yelled racial slurs at them.

The Columbia Daily Tribune reports that the incident began late Tuesday night when a group of white students walked past two members of the Legion of Black Collegian’s Activities Committee.

The legion said in a statement that one of the white students yelled a racial slur at the women, who then contacted other legion members. Campus police arrived, but the legion says members of a fraternity then began shouting other obscenities and slurs at the legion members.

Interim Chancellor Hank Foley said in a statement the university has “zero tolerance” for racism or sexism. The university also says discipline for students who violate the university’s nondiscrimination policies may include expulsion.