As of Thursday night, no one was in custody, and detectives were investigating.
In a video apparently taken at the scene, four gunshots can be heard.
The girl was dressed as a bumblebee for Halloween, the Chicago Tribune reported, and she was trick-or-treating with her father.
This is a developing story. Check back for updates and follow BuzzFeed News on Twitter.
Claudia Koerner is a reporter for BuzzFeed News and is based in Los Angeles.
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