Three-inch mortars were used during World War II by Australian forces.
WA Police requested Defence assistance to clear the “unexploded ordnance”, which was found by a member of the public on vacant land next to Hepburn Avenue.
The object was found to be inert and was removed for disposal.
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READ NOWAn ADF spokesman said he would not provide details about testing and removal due to operational security reasons.
He advised anyone who found a suspicious item that might be unexploded ordnance to not touch or disturb it, but contact the police who would arrange for military experts to dispose of it.