Eight of the business operators have been arraigned, and two are awaiting trial on bail.

Shanghai's industrial and commercial administration is still examining the other food in these stores.

A Shanghai TV program reported that a hotpot outlet in Zhoupu of Shanghai's Nanhui district is suspected of selling mutton mixed with meat of questionable origin.

The DNA test by the Pudong district's food safety watchdog showed that "mutton" sold by P-Shang Dolar Hotpot outlet was mixed with duck and other meat.

But officials said the incident has no connection with the case in Jiangsu province.

"The hotpot outlet in Zhoupu has been shut down on suspicion of selling fake food. It is being further investigated by local police," said Yang Zhenyu, head of the food safety watchdog of Pudong district.

The meat slices sold by the outlet came from the Xinpin Wholesale Market on Caobao Road where officials from the Shanghai Food Safety Office found a large amount of similar mutton in a warehouse.

Local media reported that the suspected mutton may have been sold to well-known hotpot restaurants such as Little Sheep, Dai Mei and Macao Hotpot.

Gu Zhenhua, a spokesman for the Shanghai Food Safety Office, said authorities are testing the mutton to check whether it contains other kinds of meat and whether it meets national standards.

The results are expected later this week.

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