Taiwan’s Foxconn, one of Apple’s largest suppliers, is being investigated by authorities in China, according to state media.

The probe comes weeks after founder Terry Gou announced his bid for Taiwan’s presidency and stressed that he won’t be pressured by Beijing, despite his extensive business operations in the country.

While it is unclear whether the investigations are connected to Gou’s entrance into the presidential race, analysts said the move will send jitters through foreign businesses in China.