Two men are in custody after they allegedly committed an armed robbery at Edwardstown, then collided with a police vehicle at Plympton Park, according to SA Police.
The two men travelling in a Holden sedan collided with a police car on Marion Road near Shelley Avenue.
Northbound traffic on Marion Road is being diverted around the crash site. There are no reports of serious injuries.
More details will follow when further information is known.