ITHACA, N.Y. (AP) — Cornell University has announced the temporary suspension of fraternity parties after a student reported being sexually assaulted Sunday and four others were reportedly drugged at off-campus housing in recent weeks, university leaders said this week.

All of the incidents occurred at residences affiliated with registered fraternities, according to a statement to students Monday by President Martha Pollack and Vice President Ryan Lombardi.

Police investigations are ongoing.

The suspension of fraternity parties and other social events at the Ivy League university follows an emergency meeting Sunday between the Interfraternity Council, which governs recognized fraternities, and staff, the statement said. IFC student leaders made the decision voluntarily.

A Cornell University Police alert Friday warned of at least four incidents since Sept. 24 in which students reported they had become incapacitated while attending parties off campus, despite having consumed little or no alcohol. The individuals believed they were exposed to Rohypnol, the alert said.

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