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.

While China remains the primary hub for iPhone production, Foxconn has steadily expanded its footprint in India over the past few years.

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.