Shanghai authorities are testing mislabeled mutton from a wholesaler that supplies a chain of hot pot restaurants run by US fast food firm Yum Brands, the latest safety scare to taint China’s food industry.

TVNZ reports that acting on a tip, Shanghai food safety inspectors and police raided a wholesale market and found packages labeled “New Zealand mutton” at one supplier that had no production date or list of ingredients, according to a report on the website of the municipal food safety committee.

Invoices indicated that some of the meat had already been sold to several restaurants, including outlets of Yum-owned Little Sheep, the website said. The meat was being tested and results would be available in about a week, the report added.

The mislabeled meat crackdown follows media reports last week that police had busted a crime ring that had passed off more than $1 million in rat and small mammal meat as mutton.