In a surprising turn of events, China has detained four Taiwanese employees at Foxconn's Zhengzhou plant, a key supplier for Apple's iPhone production. The Taiwanese government expressed concerns over the detentions, which are suspected to be politically motivated amid escalating tensions between China and Taiwan. Local authorities have not disclosed specific reasons for the detentions, leading to fears among investors regarding the safety of operations in China. The situation has prompted Taiwanese nationals to avoid non-essential travel to China and has raised alarms about the potential impact on Apple's reliance on Chinese manufacturing.