A probe by the Tamil Nadu government has found that a fire at the anodising plant was the probable cause of the major fire at Tata Electronics' iPhone manufacturing unit in Hosur last month.
The fire broke out in the anodising plant due to a thermostat control failure.
The fire completely destroyed the anodising facility, and further investigation is underway.
Apple dispatched a supplier responsibility team to assess the situation and provide guidance to the contract manufacturer.