A neighbour called police after discovering the item on a grassy patch of road in the suburb of Tennyson Point, northwest of Sydney's central business district yesterday.
"There is nothing at this time to indicate this incident is anything other than random," Ryde area commander Superintendent John Duncan said.
"The item is not sophisticated. All the indications at this stage of our investigation suggest that whoever had possession of this item has discarded it on the nature strip," Duncan said.
Police were unable to give any further details but the Australian Broadcasting Corporation said it understood that authorities removed two butane canisters with a wick attached. There were indications that an attempt had been made to light it, the ABC added.
Cricket Australia said Haddin, 37, who pulled out of the second Ashes Test against England on Tuesday for family reasons, was still overseas.
"He is safe with his family in the UK," a spokesman said.

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