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Police have set up a 400-metre exclusion zone around an area in Perth’s south east after discovering what is believed to be an explosive substance.

Officers conducting a vehicle stop on Harber Drive and Chiltern Avenue in Brookdale, near Armadale, discovered the item, possibly Powergel, in the car about 2.15pm.

The area has since been cordoned off and tactical response group bomb response officers have been called in.

The exclusion zone covers Ninth Avenue and Harber Drive to Tijuana Drive and Harber Drive.