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 reasons behind this sudden move aren't clear, and neither Apple nor Foxconn has made any public statements about it. Foxconn recently invested $1.5 billion to expand its operations in India, and the Indian government also approved plans for a new semiconductor factory,