WA Police personnel and emergency services crews responded to a crash in Gosnells on Monday afternoon.
The incident took place around 1.30pm, on Corfield Street near Warton Road.
It is believed that one of the vehicles involved in the crash was stolen.
Shortly after the incident, the driver of the stolen vehicle allegedly fled the scene on foot.
The crash brought Gosnells and surrounds to a complete standstill, forcing police to divert traffic.
The investigation is currently ongoing.
Anyone with information about the incident or the driver has been urged to contact Crime Stoppers on 1800 333 000 or via crimestopperswa.com.au.
Police are calling for anyone with dash-cam or CCTV footage relevant to the case to come forward.