Round Lake Beach police responded to a report of shots fired around 8:40 p.m. in the 500-block of Meadow Green Lane.
When officers arrived, they discovered a 26-year-old and an 8-year-old had been wounded. However, officials say it is too early to determine if they were hit by an actual round of ammunition or if the bullet ricocheted off something else and hit them.
The victims were transported to an area hospital with non-life-threatening injuries, according to police.
Police said they are investigating.