ITHACA, N.Y. (AP) — Cornell University has suspended the activities of a fraternity after an incident involving alcohol and an illicit substance.

Cornell says in a statement that it has suspended all social and new member education activities at the local chapter of Psi Upsilon. The Ivy League school says the suspension announced just before the weekend was agreed upon by the university, the national fraternity, its local chapter, and their alumni.

University spokesman Joel Malina says the move is aimed at preventing activities that could jeopardize the safety of members and their guests. An investigation is proceeding, but the university declined further comment.

Cornell has taken steps to curb excessive drinking and sometimes dangerous hazing initiations.

In 2011, a member of Sigma Alpha Epsilon died of alcohol poisoning linked to fraternity pledging.