Apple is expected to cut production of its latest iPhone models by about 30% in the January-March quarter due to mounting inventories, the Nikkei reported, rattling the nerves of investors in the US giant’s Asian suppliers.

Apple chief Tim Cook is “deeply offended” by allegations made in BBC’s Panorama that the technology giant mistreats workers at its Chinese factories.

Apple will investigate allegations by advocacy group China Labour Watch that factories run by Taiwanese supplier Pegatron use underage workers, pay insufficient wages and force employees to work overtime.

A labour rights group has accused a supplier of Apple in China of misconduct including withholding employees’ pay and environmental violations.