Updated at 11:09 am EST Apple ( AAPL ) shares moved lower again Wednesday after officials in China ordered a seven-day lockdown around a key iPhone factory amid an ongoing Covid outbreak that could snarl production heading into the crucial holiday season. City officials in Zhengzhou ordered the lockdown, which will last until November 9, in and around the 200,000-person factory run by Taiwan's Foxconn, a key Apple assembler responsible for around 70% of the tech giant's iPhone shipments. Data suggests infections in the city have tripled this week, to around 360 cases, prompting the strict lockdown response that echoe's Beijing's 'zero Covid' policies. Foxconn said it would keep the plant operating as part of a 'closed loop' strategy -- where workers remain on premises until the lockdown order expires -- but may struggle to maintain production levels as workers left the compound earlier this week in advance of the lockdown orders.