China's food regulator has visited 600 fast food outlets and food distributors over fears out-of-date or rotten meat is being sold for consumption, the watchdog said in a statement.
Big chains like McDonald's, Starbucks and KFC-parent group Yum Brands Inc have already been dragged into the safety scare.
The investigation comes after five people from OSI Group, the US parent of China-based meat-processing factory at the center of the incident, were arrested. Yum has now severed ties with the group.
More top news
Stars have vented their frustration over Sony's decision, with Rob Lowe comparing it to Neville Chamberlain caving in to Hitler.
Derby was unable to play with other dogs after being born with severely deformed front legs - but can now run freely.
The judge said the 14-year-old had been subject to a great injustice. He was executed for the murder of two little girls in 1944.