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

Apple is one of those companies, having started shifting part of its iPhone production to India four years ago. However, Foxconn, the company that makes most of Apple's devices, has done something that may put this diversification strategy in peril,