CHARLESTON, W.Va. — Fraternity and sorority activities have been suspended at West Virginia University after a student was hospitalized following an incident at the Kappa Sigma fraternity house late Wednesday night.

WVU student Nolan Burch, 18, of Buffalo, New York, was still in the Intensive Care unit at Ruby Memorial Hospital in critical condition late Thursday, according to a hospital spokeswoman.

A 911 call was made from the fraternity house just before midnight on Wednesday, where police found someone giving Burch CPR, according to a release from the Morgantown Police Department.

Burch was on the floor without a pulse or any respiration, according to police.

WVU and Morgantown Police are investigating the cause of Burch’s condition.

WVU officials, along with the Inter-Fraternity Council and Panhellenic Council, placed a moratorium on the entire WVU Greek system Thursday that suspends social and pledging activities until further notice.

WVU officials called the incident a “catastrophic medical emergency” and said the student was “gravely ill.”

Several WVU students spoke out on social media, alleging that the student died from a drug and/or alcohol overdose during a fraternity event.