Apple has announced delays in the production of its latest range of smartphones, the iPhone 14 Pro and Pro Max, due to Covid restrictions put in place by key manufacturers in China.

Foxconn, which operates an iPhone manufacturing facility in Zhengzhou, China, announced this week that it is introducing additional restrictions at the facility.

Covid-19 cases in Henan province, where the plant is located, are the highest since February. This is based on data from the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University.

According to Reuters, a post by Foxconn on Chinese social media platform WeChat appeared to report that workers’ movement between the factory floor and dormitories was being restricted.

In a statement, Apple said its Zhengzhou iPhone assembly plant is “currently operating at significantly reduced capacity.” It says this will likely result in fewer shipments of the products until production can return to normal.