People have been beaten and detained after protests by staff working at a huge factory making iPhones in the central Chinese city of Zhengzhou.
Footage posted online shows hundreds of workers involved in demonstrations with some smashing surveillance cameras and windows.
Video shows police in masks, along with other officials in white hazmat suits, swinging batons and sticks at protesters.
On social media, staff have been complaining about pay, claiming new staff were persuaded to work at the huge factory – where 70% of iPhones are made – in return for bonuses.
A protest erupted on Tuesdayafter claims the operator, Foxconn, changed those terms.
Last month, thousands of employees at the site walked out over complaints about unsafe working conditions because of coronavirus cases in the facility.
Meanwhile there’s wider frustration with the ultra-strict COVID-19 restrictions in China, where millions have been confined to their homes with little warning, for weeks at a time.
In October, following rising COVID-19 cases in Zhengzhou, Foxconn put the plant’s 200,000 workers under closed-loop management – a system where staff live and work on site, isolated from outside.
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That prompted some migrant workers to flee the plant’s campus and return to their hometowns.
Earlier this month, the Chinese government called on retired military and government workers to help boost production at the factory because of COVID staff shortages, even offering bonuses.