On April 12 at 4:39 p.m., a woman approached a security guard in the 1100 block of South Hayes Street, stating that she believed a man was taking pictures of children not known to him, police said.
The security guard made contact with the man, who was photographing his own children.
The woman then intervened, police said, deploying pepper spray on the man before fleeing on foot.
The suspect is described as a black female, in her late 20s to mid-30s, average build.
The victim sustained injuries that were treated on the scene by medics.