Authorities in China have found the novel coronavirus on the packaging of imported frozen seafood that arrived from the port city of Dalian, which recently battled a surge of cases, Reuters reports.

The virus was found on the outer packaging of frozen seafood bought by three companies in Yantai, a port city in eastern Shandong province.

The Yantai city government said in a statement the seafood was from an imported shipment that landed at Dalian but did not say where it originated.

Authorities had sealed off the goods, the city government said. Everyone who handled the goods was under quarantine and have tested negative for the coronavirus, it said.