A UW-Madison fraternity had just recently come off "alcohol probation" when it was temporarily suspended this week because members allegedly yelled racist slurs and threw a bottle at two black female students.

The probation, which was lifted March 1, meant that Delta Upsilon fraternity couldn't hold events, including parties, with alcohol. It was a result of a September incident that involved an intoxicated student who was under the legal drinking age, said Kevin Helmkamp, associate dean of students.

"The alcohol would be a pattern of concern," Helmkamp said.

Delta Upsilon, 644 N. Frances St., was put on emergency suspension late Tuesday while the university investigates allegations that in the early morning of March 16, students partying on the porch yelled "racial slurs and class-oriented taunts" at the two women, according to a UW-Madison statement. A glass bottle was reportedly thrown at the women as they were trying to leave the property.

Michael Underkofler, who is listed on the Delta Upsilon website as the group's president, did not return phone or email messages left by the State Journal on Thursday. The executive director of the national headquarters, Justin Kirk, said in a statement that the fraternity will work with university officials and chapter leaders to investigate the allegations.