A Chicago Police spokeswoman says the human remains found frozen to the ground in a field on Chicago's southwest side are not related to the disappearance of Stacy Peterson.

Police spokeswoman Monique Bond also says the body is not related to the disappearance of Lisa Stebic.

The Cook County medical examiner's office says an autopsy is scheduled today on the badly decomposed remains found Friday by a suburban land surveyor.

Authorities say the worker found a human foot and leg near a blue garbage can. But Chicago police have said they did not find a blue garbage can.

The body was found about 100 feet from a set of train tracks just south of the Chicago Sanitary and Ship Canal.

Peterson has been missing since October and Stebic has been missing since April.