Residents of Lafayette Hall were temporarily moved to the Marvin Center for about half an hour Saturday night.

A snow-covered air vent caused a carbon monoxide alarm to sound in the residence hall, which about 130 students live in, at approximately 8:15 p.m., University spokeswoman Maralee Csellar said.

She said D.C. Fire and EMS, as well as University Police Department officers, responded to the alarm.

“DC Fire and EMS and GWPD quickly identified the cause of the issue to be a snow covered air intake vent,” Csellar said. “We thank the students for their cooperation during the evacuation.”

Csellar said the building was cleared for reentry at approximately 8:45 p.m.