Authorities confirmed Tuesday that they found a female’s body in a south suburban forest preserve.

The FBI declined to identify the body but said they believe the female was the victim of a kidnapping. The body was found in the Thornton-Lansing Road Forest Preserve in the south suburbs, the FBI said.

Earlier this month, the FBI offered a $10,000 reward for information about 27-year-old Sidne-Nichole Buchanan, a Gary woman who went missing July 27 after a concert in Tinley Park.

“Our investigation has revealed that Sidne was last seen in Illinois but we have evidence that she was in Indiana after that. The presumption is she was taken across state lines against her will until we find evidence to the contrary,” FBI Supervisory Special Agent Mike Peasley said at the time.

The FBI is currently awaiting the results of an autopsy, agency spokeswoman Chris Bavender said. No one is in custody and the investigation is ongoing.