Around 10pm on Friday 20 September 2019, a group attended a fast food restaurant on Hale Road Forrestfield.
As the group were departing around 10.20pm, a Hyundai Getz pulled up alongside them blocking the drive through lane.
Several males alighted from the vehicle, two members from this group were carrying baseball bats.
The men threatened the victims with the baseball bats, the victims attempted to run away however a 15 year old boy was assaulted rendering him unconscious.
The 15 year old regained consciousness and was taken to Saint John of God Midland for medical attention. X-rays revealed that he received a broken jaw and nose from the assault.
Another 15 year old boy was also assaulted, receiving minor injuries.
Police have released CCTV images of the Hyundai Getz that the group arrived at the scene in.
Anyone who witnessed the incident or has information about the offence are asked to contact Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au all reports to Crime Stoppers can be made anonymously and rewards are available.