DAVIS COUNTY, Utah — A building at Hill Air Force Base was evacuated Thursday morning after an “unusual smell” was detected.

According to an official statement from the base, the smell was detected at approximately 9:40 a.m.

The building was then evacuated.

After the evacuation, an “undetermined” number of people voluntarily went to area hospitals for a precautionary check-up.

“The base is unaware on any serious illnesses,” read the statement.

As of 2 p.m., the building is still evacuated while crews work to determine the cause of the smell.

The building where this incident occurred was not identified.