According to early reports, a BMW was being pursued by police, by possibly up to five unmarked cars when it hit a pole on Beach Road, Malaga and split in two.
One part of the car struck another vehicle causing another collision.
Both drivers escaped serious injury.
A WA Police spokeswoman said an elderly man was taken to Royal Perth Hospital for treatment but his injuries were not thought to be life-threatening.
Emergency services remain at the scene.
Beach Road has been closed in both directions, along with Camboon Road to Harlond Avenue in Malaga.