Apple's largest iPhone producer has reportedly ordered hundreds of its India-based Chinese workers to return to their native China but for unspecified reasons.

Foxconn Technology Group has asked hundreds of Chinese engineers and technicians to return home from its iPhone factories in India, dealing a blow to Apple Inc.’s manufacturing push in the South Asian country.

Apple’s biggest assembly partner, Foxconn, has ordered more than 300 of its Chinese employees to return home from its iPhone factories in India, Bloomberg reported, citing anonymous sources. The employees told to return account for the bulk of Foxconn’s staff in its iPhone facilities in India,