It happened around 10:20 p.m. Friday in a parking lot by the Wal-Mart on N. University St. in Peoria.
Police say a birthday party was happening nearby at Landmark Recreation Center. Officers got a call for a fight between 200-300 people.
A 17-year-old boy and a 13-year-old boy both were shot in the leg. Their injuries are not life-threatening.
Police say they don't know who pulled the trigger.