Stun-gun pointed at accused man

Earlier, Senior-Sgt Bert Cohen said a chase began along the Kwinana and Graham Farmer freeways about 7pm on Friday after a driver tried to ram a police car at a service station in Thomas Rd, Bertram. After leading police for more than 20km the driver rammed a second police car and another vehicle just south of Canning Bridge. Sen-Sgt Cohen said the driver pulled into the emergency lane and reversed into the police car. One officer suffered concussion when his head hit the windscreen.

The driver then did a U-turn and drove south against the traffic in the northbound lanes of Kwinana Freeway. Police pursued the utility on to the Graham Farmer Freeway, through the tunnel and on to Orrong Rd, where it did a U-turn and returned to the Graham Farmer Freeway. A "stinger'' placed on Graham Farmer Freeway, near the Windan Bridge, deflated the ute's right tyre. The driver then allegedly menaced police with two knives and was arrested after being subdued with stun-guns.

The concussed police officer was treated at Fremantle Hospital.