Dramatic footage of workers purportedly fleeing one of the largest iPhone assembly factories in China due to a COVID-19 outbreak emerged online over the weekend.

Among the widely shared videos is a clip uploaded by BBC correspondent Stephen McDonell apparently showing employees climbing over fences of a facility owned by Foxconn, a major manufacturer for Apple, in the city of Zhengzhou.

Zhengzhou, the capital and largest city of Henan Province, recorded 167 locally transmitted COVID-19 cases from Oct. 23 to Oct. 29. The citywide outbreak, which resulted in the closure of surrounding shops and hotels, prompted Foxconn to force some of its workers into quarantine.

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In a statement to The New York Times on Thursday, the company confirmed that a “small number of employees” had been asked to quarantine, without elaborating on details of the measures it implemented.

Read more: Nextshark