Students chanting homophobic slurs at a University of Minnesota-Duluth men’s hockey game have prompted the school to crack down. UMD says that fans chanting sexist, racist or homophobic words will be asked to leave.

“These words were extremely derogatory toward women and gays and lesbians,” UMD student Alyssa Longley wrote to school officials after attending a game. “Prejudice does not go away on its own and, left unchecked, can spiral into dangerous situations.”

“Group mentality took over; they ended up portraying UMD as a vulgar and clearly not open-minded place to be, where I feel very comfortable on this campus being a lesbian,” Alyssa Longley, a freshman, told the Duluth News Tribune. “I am treated really, really well here. They didn’t show that … at that instance.”

School officials said they will be on the lookout for such behavior at sports events.