Kansas University officials have identified a malfunctioning motor in an exhaust fan as the source of an odor that caused an evacuation of Malott Hall on Monday, said Jill Jess, a university spokeswoman.

The hall was evacuated Monday about 4:30 p.m., and reopened at 6:45 p.m. after the smell had dissipated and officials had ensured the air quality was safe.

Two university employees complained of headaches during the incident — one was treated on the scene and the second was transported to Lawrence Memorial Hospital.