Police are investigating an assault on a staff member at King Carnival in Halls Head.
It is alleged a man broke into an arcade machine and stole cash around 4.45pm on Sunday.
When the female staff member confronted him he allegedly punched her in the head.
It is understood the victim received a cut to her face.
Anyone with information about this incident is asked to contact Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.com.au.