An odor that led to the evacuation Monday night of the Chemistry and Physics Building on the University of Kentucky campus was blamed on a drain, according to UK Police.
The Lexington Fire Department determined that the smell was non-hazardous.
Investigators said no one was injured and that there wasn't any damage to the facility.
UK Police said they believed the building would be able to open for classes on Tuesday.
According to the school, around 8:52 p.m., students in room 225 smelled an odor and some of them complained of developing a headache.
The students evacuated the room on their own and called campus police.
The first UK Police officer on the scene activated a fire alarm pull station in order the evacuate the entire building as a precaution, according to the school.
The Lexington Fire Department was called-in to investigate and that stretch of Rose Street was closed to traffic.
The Fire Department set up a command post outside the building.
After determining that the odor was not a hazard, the building was turned back over to the university and school maintenance crews began their own investigation.
Rose Street was reopened.