Shoppers at a Christchurch supermarket are being asked to check if they have purchased a specific batch of mince which could contain metal pieces.
Pak'nSave Hornby is recalling its prime beef mince, best before Sunday, as it could contain "foreign matter".
Shoppers who have consumed this product and have concerns about their health are being advised to seek medical advice.
The mince can be returned for a full refund.
"This recall does not affect any other Pak'nSave Hornby brand product," the Ministry for Primary Industries (MPI) said in a statement.
Store staff quickly became aware of the potential issue, according to Foodstuffs - the company which owns Pak'nSave.
"We apologise for any inconvenience caused to customers who have purchased this product," Foodstuffs spokeswoman Antoinette Laird said in a statement.
Staff immediately enacted food safety protocols, Foodstuffs said, and there have been no reports of any metal at this stage. The company apologised for any inconvenience.
An MPI spokeswoman said the product became contaminated after a metal lid fell into the mincer.
"The use of CCTV has confirmed the problem is isolated to once specific batch of minced meat with a best before date of January 12, 2020 purchased from the store between between 11am and 1:30pm on January 9, 2020," she told Newshub.
"Of the affected product, 40 trays have been sold to consumers and a further 40 trays have been removed from sale by the store."
MPI says anyone with questions should contact the supermarket directly.
"Affected products should not be consumed."