Excerpts from Chicago.cbslocal.com:

Firefighters were training when they discovered a smoldering body laying in the grass. The drill turned into a death investigation in the 1300 block of Joliet Street in West Chicago. Investigators were on the scene almost ten hours after the body was found burning in a field. There were a number of boarded up homes on the abandoned property.

Firefighters say they were scheduled to burn the abandoned houses in a controlled burn exercise when they made the gruesome discovery. West Chicago Police say the body was of an adult male. His identity is being withheld until an autopsy is performed and the family is notified.