More than 4,000 students in central China were sent to quarantine facilities on Sunday after a cluster of Covid-19 cases was found at their school, according to local authorities.
Officials in Anyang city, Henan province said a total of 4,040 children from Tangyin Yucai School, from elementary to high school students, were transferred to three centralized quarantine facilities.
Videos from Chinese state media and social media showed the students wearing full hazmat suits while boarding buses.
Anyang officials said Tuesday they had imposed a strict lockdown on all 5.5 million of the city's residents after confirming a total of 84 cases in a local Covid cluster.
Residents are banned from leaving their homes unless to undergo mass testing for Covid-19 and all factories and non-essential businesses have been shut.
The Anyang outbreak is believed to be linked to a college student who traveled to the city from Tianjin on December 28 while infected with the Omicron variant, according to the local health commission.