Seventeen of the people who attended the Virginia Tech ceremony Sunday had to be taken to the hospital after a suspected carbon monoxide leak.

It happened at an apartment complex near the campus. Two Virginia Tech students are in critical condition.

They were flown to the University of Virginia Medical Center and the three others were flown to Duke University Medical Center. The five female students were found unresponsive in their beds in the Collegiate Suites Apartment Complex.

The twelve others were taken to the Regional Hospital and are in stable condition. At least four others were treated on the scene. The apartment complex was evacuated, and police are investigating.