A German world war In hand grenade was found among a shipment of French potatoes imported into a sharp factory in Hong Kong, police said.
The device was probably detonated after it was discovered at the Calbee snack factory on Saturday.  "The border was in an unstable state because it was previously discharged, but it hasn't been detonated," says superintendent Wilfred Wong Ho-hon to journalists.
The police blew it on the spot, Wong said, with a police video showing bomb handling officers packing the grenade into a drainage channel at the factory before blowing it up.
The grenade was eight centimeters wide and weighed about one kilogram.
"All the information so far indicated showed that the grenade was imported from France along with other potatoes," Wong said.
The Grenade is believed to have been left in a grave pit during World War I and randomly gathered with potatoes planted a century later in the former battlefield.
"If it was covered in mud, the grenade was probably left behind, fell by soldiers there during the war or left there after it was thrown," says Hong Kong University military historian Dave Macri South China Morning Post .
"The ditch was then filled up and used as a growing field, and the explosive was thrown into the mixture of harvested potatoes … and sent to Hong Kong."
Hong Kong police are used to dealing with old ammunition, although more commonly American bombs fell on the city after it fell to the invading Japanese during World War II.
Last year, the bombing disposal campaign fought three major WWII bombs, two of which were found in a place in the busy Wanchai district where work was underway to build a new subway station.
Unexploded wars or grenades are often found by walkers or construction workers in the southern Chinese city, who were the site of fierce battles between Japanese and British allies demanded in 1
The then British colony was heavily bombed by the United States and allied forces that the city fell to the Japanese imperial forces.