LAWRENCE, Kan. (AP) — The Interfraternity Council at the University of Kansas is voluntarily imposing a temporary freeze on activities at all 24 fraternities it oversees. Monday's announcement comes after at least three KU fraternities were disciplined because of violations of university codes. Few details about the violations have been made public. The council says it will work with university officials to improve oversight and address "systemic behavioral issues." During the freeze, the council plans to develop a plan that will include higher standards in several areas. During the freeze, fraternities will be allowed to have only chapter meetings, philanthropic events and service events. Fraternity members will be able to continue living in the houses. The length of the freeze and conditions for having it lifted has not been determined.