The McDonald's (MCD) - Get Report office in Seoul, South Korea has been raided following a series of complaints tied to food-related illness.

Investigators in South Korea raided the fast-food conglomerate's office in the country following complaints that children have been becoming ill after eating hamburger patties, allegedly undercooked, South Korean news outlets are reporting.

Documents along with other information from McDonald's and ingredient suppliers have been seized by the Seoul central district prosecutors' office.

Shares of McDonald's were flat in early morning trading on Wednesday.

More of What's Trending on TheStreet: