Story highlights A child's feet, hands and a head are found in a Chicago park

Authorities don't know yet if the parts are from the same body

(CNN) Authorities in Chicago say they don't know yet whether child body parts found in the city's Garfield Park are from the same body.

Over the weekend, after a human foot was discovered, searchers recovered the head, two hands, and another foot of a child, according to the police department and the city's medical examiner's office. Investigators found the hands and feet in a lagoon in the park on Saturday and officers continued searching into the night, video footage from CNN affiliate WLS showed.

A source with knowledge of the investigation said it was a citizen who made the first discovery in the park.

A search of the same area Sunday recovered the head.

Chicago police spokesman Anthony Guglielmi said investigators also found a plastic bag that was brought to a lab to be opened in a sterile environment. Guglielmi said he believes the remains were somehow separated from the bag.

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