Foxconn said on Thursday a pay-related "technical error" occurred when hiring new recruits at a COVID-hit iPhone factory in China and apologised to workers after the company was rocked by fresh labour unrest. Men smashed surveillance cameras and clashed with security personnel as hundreds of workers protested at the world's biggest iPhone plant in Zhengzhou city on Wednesday, in rare scenes of open dissent in China sparked by claims of overdue pay and frustration over severe COVID-19 restrictions.