Hong Kong (CNN) War relics are often discovered in unusual places, but few finds are as unexpected as this one.

A German-made grenade from World War I was discovered in Hong Kong on Saturday among a shipment of potatoes, police have said.

The shipment had come from France, headed for an industrial estate that includes a potato chip factory.

"The grenade was imported from France together with the other potatoes," Superintendent Wong Ho Hon Wilfred told media Saturday.

It was in a "stable condition because it had been previously discharged, but it had failed to detonate at the time of discharge," he added.

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