Shanghai Municipal Food and Drug Administration inspected four McDonald's restaurants in the city on Thursday and didn't find any food safety problems, the Information Office of Shanghai Municipal Government said late on Thursday.

Items including the restaurants' purchase records, employees' operating processes and the sanitation of the kitchen were checked.

The inspection came after a former employee of the US fast food behemoth in Louisiana posted pictures on social media of a greasy part from a machine that he claimed produced ice cream, which triggered an online discussion in China.