A World War I-era hand grenade was found among a shipment of potatoes delivered from France to a potato crisp factory in Hong Kong’s New Territories on Saturday.

A worker at Calbee Four Seas Co Ltd on Chun Cheong Street in Tseung Kwan O Industrial Estate was picking out potatoes shipped from France to be processed to potato crisps when he found a metal object covered with mud in a batch of about 1,000 potatoes, Apple Daily reported. Police arrived and identified the object as a German grenade dating back to World War I.

The grenade was eight centimeters wide and “in an unstable condition” because it had been discharged but failed to detonate, according to Wong Ho-han, an assistant district commander. Officers from the Explosive Ordnance Disposal Bureau were called in and safely detonated the one-kilogram device at the scene about noon using high-pressure water technique.

Wong said there was no evidence that any crime had been committed, adding that the bomb had been encrusted in dirt and was found among a shipment of potatoes from France, Ming Pao Daily reported. In 2018, three bombs from World War II were found at an MTR construction site in Wan Chai on Hong Kong Island.

Read: Police defuse third WWII bomb found in Wan Chai