Northern Kentucky University administrators have suspended the school's chapter of Delta Sigma Theta Sorority Inc. for hazing its pledges.
Three students were subjected to "repeated and severe paddling," school officials said in a statement released Friday.
They sought medical treatment for injuries including blistering, infections and fractures.
The alleged incidents happened over several days in the first week of March at an off-campus house.
NKU said it first become aware of the incidents March 9 when the mother of a student complained. The students believed they were taking part in a traditional initiation ritual to become sorority members, according to a news release.
Highland Heights police are expected to charge four current NKU students and two former students with fourth-degree assault, The Kentucky Enquirer reports.
NKU administrators have identified the four students from Cincinnati and Louisville accused of hazing and said they face university discipline.
NKU said the national sorority has cooperated in the investigation.
Police declined to comment. Several students in the sorority did not respond to The Kentucky Enquirer's messages seeking comment.
An anti-hazing statement on the Delta Sigma Theta Web site prohibits "all acts of hazing or harassment, both physical and mental."
NKU also has "zero tolerance for hazing." Gabe Cronon, NKU student government president, said all Greek students undergo workshops about hazing and what is allowed by law.
"National organizations take this very seriously," said Cronon, a member of an NKU fraternity. "It's a difficult position to be in as a student to report hazing. It's normally emotional stress. This is the first one I'm aware of in a while at NKU."