Rockingham Police are asking any witnesses to come forward who might have information in relation to two separate incidents where an ambulance and car were damaged.
Police are investigating after rocks were thrown at vehicles, including an ambulance around Rockingham this week.
The first incident took place just before 11pm on Monday. A vehicle had its windscreen smashed while driving along Eighty Road in Baldivis.
The second incident, which involved an ambulance, occurred on Tuesday evening at 12:30am. The ambulance window was smashed while driving along Kulija Road in Baldivis.
Police are asking anyone with dashcam footage of the motorbike to come forward or visit the Rockingham Police Station.