A University of Kansas fraternity is on interim suspension after the school received reports of sexual assault during a party during the weekend.

University Chancellor Bernadette Gray-Little said in a news release Wednesday that “disturbing and serious” behavior was reported at the Kappa Sigma fraternity. She did not elaborate.

The Lawrence Police Department and the Office of Institutional Opportunity and Access are investigating the allegations.

The suspension come as the university faces increasing criticism for its handling of previous allegations of rape on the Lawrence campus. Kansas is one of 76 schools nationwide being investigated by the federal government for their handling of sexual abuse cases.

In response to the criticism, Gray-Little appointed a task force to review the school’s policies and procedures and to recommend improvements.