CHICAGO (CBS CHICAGO) — On Wednesday, Chicago Police released sketches of a person whose severed head was found inside a bag last week in the McKinley Park lagoon in hope of finding out who they were.

The human remains were found about 10 a.m. Sept. 23 at the park at 2210 W. Pershing, according to Chicago Police.

A Chicago Park District worker found the bag during a routine clean-up, a source said.

The remains of the person found were described as black, between 15 and 25 years old, police said. Investigators are unsure if they were male or female.

Anyone with information on the person’s identity is asked to call police at (312) 747-8730.