(CNN) — A South Dakota company is recalling more than 2.2 million pounds (998,000 kilograms) of Korean barbecue pork jerky sold at Costco and Sam’s Club stores because the product may be contaminated with pieces of metal, federal health officials said Friday.

LSI, Inc., of Alpena, voluntarily pulled the product after customers complained about finding pieces of wiry metal in the jerky, according to the U.S. Agriculture Department. Company officials said the metal came from a conveyor belt used in production. No confirmed injuries have been reported,

The recall includes 14.-5-ounce (410-gram) and 16-ounce (450-gram) plastic pouches of meat jerky labeled “Golden Island fire-grilled pork jerky Korean barbecue recipe.” Roughly four dozen lots of jerky are affected. The products have a o

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