Three people have been arrested after a dramatic arrest at Narrows Bridge on Tuesday afternoon.
Authorities are believed to have stopped a car after a police license plate scanner issued an alert for the Hyundai.
Officers reduced traffic to a single lane when they intercepted the vehicle.
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At least one more police car was called in for support and three people were arrested for questioning.
It is understood one of them was wanted by WA police.
The vision captured by 7NEWS showed items confiscated by car police on nearby Fraser Lane south of Perth.