A flyer posted on Facebook and Instagram said a back-to-school event called "Peace in the City" was going on at the park when the shooting happened.
Dwight Harvey, who is the father of the event's organizer, was streaming the event live on his Facebook page when the shooting occurred.
In the video, many children and parents are sifting through backpacks stuffed with school supplies under a pavilion at the park when 12 rapid-fire shots ring out.
After consulting with the State Attorney’s office, detectives do not expect to file charges against the bystander since his actions were within the law according to the preliminary investigation, police said.
No further details are available at this time.