(CNN) -- A suspicious package at the mail center of an Air Force base in Illinois prompted the evacuation of several buildings, officials said Wednesday, and three people were treated at a hospital.
The report of the package at Scott Air Force Base came in at 9:26 a.m., said Lt. Benjamin Garland, base spokesman.
The building containing the mail center was evacuated, along with surrounding buildings, including an education building; a bowling alley; an information, ticket and tours office; and a readiness center, Garland said.
The three people were taken to the hospital as a result of possible chemical exposure, said another base spokesman, Thomas Kistler. The base posted on Twitter that the three were treated and released, but provided no additional details.
Thirteen people were being decontaminated on the scene as a precaution, Garland said.
The base is about 25 miles east of St. Louis, Missouri.
CNN's Alta Spells and Kara Devlin contributed to this report.